Did Lee Harrison ever furnish disks on all four rear wheels or disks on the middle wheels only with drums in the rear?
Tom Whitton26 foot updated GMCPaducah, KY
Tom Whitton26 foot updated GMCPaducah, KY
Six wheel disks?
- Thread starter thomas r whitton
- Start date
Leigh offered both the mid bogie and rear bogie disk brake kits. They are no longer available as far as I know. The best mid bogie brake setup is the Dave Lenzi unit out there right now, it is a massive brake system that also allows for an emergency caliper on the rotor. You only really need to have disks on the mid bogie and a drum set on the rear. Call call Dave and talk to him.
J.R. Wright
GMC GreatLakerTech Editor
78 Buskirk 30' Stretch
75 Avion Under Reconstruction
Michigan
>
>
> Did Lee Harrison ever furnish disks on all four rear wheels or disks on the middle wheels only with drums in the rear?
> Tom Whitton26 foot updated GMCPaducah, KY
> _______________________________________________
> GMCnet mailing list
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> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
J.R. Wright
GMC GreatLakerTech Editor
78 Buskirk 30' Stretch
75 Avion Under Reconstruction
Michigan
>
>
> Did Lee Harrison ever furnish disks on all four rear wheels or disks on the middle wheels only with drums in the rear?
> Tom Whitton26 foot updated GMCPaducah, KY
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
I seem to remember a set of center drums (to save money) and an all disc
set for performance.
Sammy
>
> Did Lee Harrison ever furnish disks on all four rear wheels or disks on
> the middle wheels only with drums in the rear?
> Tom Whitton26 foot updated GMCPaducah, KY
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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>
set for performance.
Sammy
>
> Did Lee Harrison ever furnish disks on all four rear wheels or disks on
> the middle wheels only with drums in the rear?
> Tom Whitton26 foot updated GMCPaducah, KY
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
We put six wheel disks and tru-traks on Stick Miller's second coach, replacing the big mid wheel disk that Lee Haeeison provrided. I don't think it
made a great difference either way. Around here, rear drums with reaction arms do as well for less money. The rear disks >might< have an advantage
in the mountains.
--johnny
--
76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased
made a great difference either way. Around here, rear drums with reaction arms do as well for less money. The rear disks >might< have an advantage
in the mountains.
--johnny
--
76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased
We used to say in drag racing, weight reduction by one pound is equal to 2
horsepower gained. If you really want your coach to stop as well as
possible, leave the anvil at home as well as the stump it is mounted on.
Keep weight as far to the rear of the coach as practical, and as low as
possible. If you don't pack it along, you don't have to burn gas to
accelerate it, nor wear out brake lining trying to stop it. But, you
already know that, right?
I have installed most of the improved braking systems out there, and
by far, hands down, the most effective system at stopping the coach is a 6
wheel all disc system with a 1 ton front end with 11 inch rotors, and
reaction arms on the four rear rotors. I prefer using the standard master
cylinder, BUT, YOU GOT TO CHECK THE FLUID OFTEN IF YOU USE IT instead of
the P-30. Convert your original distribution valve to all disc, or replace
it with an all disc valve.
The trade off with this all disc system is no parking brake. I have
never set my parking brake since the first time I drove the coach after I
bought it. The cables were rusty and sticky and did not release after I
applied them. I very soon had smoking rear brakes. After several attempts
to repair them, including new rear cables, and a pulley system on the
forward cable, I quit pulling on the parking brake.
Reaction arm brakes will make your coach stop like a modern
automobile, and make everything in your coach that is not nailed down
subject to movement.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Feb 9, 2018 5:44 AM, "Johnny Bridges via Gmclist" <
> We put six wheel disks and tru-traks on Stick Miller's second coach,
> replacing the big mid wheel disk that Lee Haeeison provrided. I don't
> think it
> made a great difference either way. Around here, rear drums with reaction
> arms do as well for less money. The rear disks >might< have an advantage
> in the mountains.
>
> --johnny
> --
> 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> "I forgive them all, save those who hurt the dogs. They must answer to me
> in hell" - ol Andy, paraphrased
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
horsepower gained. If you really want your coach to stop as well as
possible, leave the anvil at home as well as the stump it is mounted on.
Keep weight as far to the rear of the coach as practical, and as low as
possible. If you don't pack it along, you don't have to burn gas to
accelerate it, nor wear out brake lining trying to stop it. But, you
already know that, right?
I have installed most of the improved braking systems out there, and
by far, hands down, the most effective system at stopping the coach is a 6
wheel all disc system with a 1 ton front end with 11 inch rotors, and
reaction arms on the four rear rotors. I prefer using the standard master
cylinder, BUT, YOU GOT TO CHECK THE FLUID OFTEN IF YOU USE IT instead of
the P-30. Convert your original distribution valve to all disc, or replace
it with an all disc valve.
The trade off with this all disc system is no parking brake. I have
never set my parking brake since the first time I drove the coach after I
bought it. The cables were rusty and sticky and did not release after I
applied them. I very soon had smoking rear brakes. After several attempts
to repair them, including new rear cables, and a pulley system on the
forward cable, I quit pulling on the parking brake.
Reaction arm brakes will make your coach stop like a modern
automobile, and make everything in your coach that is not nailed down
subject to movement.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Feb 9, 2018 5:44 AM, "Johnny Bridges via Gmclist" <
> We put six wheel disks and tru-traks on Stick Miller's second coach,
> replacing the big mid wheel disk that Lee Haeeison provrided. I don't
> think it
> made a great difference either way. Around here, rear drums with reaction
> arms do as well for less money. The rear disks >might< have an advantage
> in the mountains.
>
> --johnny
> --
> 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> "I forgive them all, save those who hurt the dogs. They must answer to me
> in hell" - ol Andy, paraphrased
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
Jim,
Some states require a mechanically actuated emergency brake. That's why I left the drums on the rears when I first registered it in
New Jersey.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of James Hupy
Sent: Saturday, February 10, 2018 3:29 AM
To: gmclist
Subject: Re: [GMCnet] Six wheel disks?
We used to say in drag racing, weight reduction by one pound is equal to 2
horsepower gained. If you really want your coach to stop as well as
possible, leave the anvil at home as well as the stump it is mounted on.
Keep weight as far to the rear of the coach as practical, and as low as
possible. If you don't pack it along, you don't have to burn gas to
accelerate it, nor wear out brake lining trying to stop it. But, you
already know that, right?
I have installed most of the improved braking systems out there, and
by far, hands down, the most effective system at stopping the coach is a 6
wheel all disc system with a 1 ton front end with 11 inch rotors, and
reaction arms on the four rear rotors. I prefer using the standard master
cylinder, BUT, YOU GOT TO CHECK THE FLUID OFTEN IF YOU USE IT instead of
the P-30. Convert your original distribution valve to all disc, or replace
it with an all disc valve.
The trade off with this all disc system is no parking brake. I have
never set my parking brake since the first time I drove the coach after I
bought it. The cables were rusty and sticky and did not release after I
applied them. I very soon had smoking rear brakes. After several attempts
to repair them, including new rear cables, and a pulley system on the
forward cable, I quit pulling on the parking brake.
Reaction arm brakes will make your coach stop like a modern
automobile, and make everything in your coach that is not nailed down
subject to movement.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Feb 9, 2018 5:44 AM, "Johnny Bridges via Gmclist" <
> We put six wheel disks and tru-traks on Stick Miller's second coach,
> replacing the big mid wheel disk that Lee Haeeison provrided. I don't
> think it
> made a great difference either way. Around here, rear drums with reaction
> arms do as well for less money. The rear disks >might< have an advantage
> in the mountains.
>
> --johnny
> --
> 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> "I forgive them all, save those who hurt the dogs. They must answer to me
> in hell" - ol Andy, paraphrased
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Some states require a mechanically actuated emergency brake. That's why I left the drums on the rears when I first registered it in
New Jersey.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of James Hupy
Sent: Saturday, February 10, 2018 3:29 AM
To: gmclist
Subject: Re: [GMCnet] Six wheel disks?
We used to say in drag racing, weight reduction by one pound is equal to 2
horsepower gained. If you really want your coach to stop as well as
possible, leave the anvil at home as well as the stump it is mounted on.
Keep weight as far to the rear of the coach as practical, and as low as
possible. If you don't pack it along, you don't have to burn gas to
accelerate it, nor wear out brake lining trying to stop it. But, you
already know that, right?
I have installed most of the improved braking systems out there, and
by far, hands down, the most effective system at stopping the coach is a 6
wheel all disc system with a 1 ton front end with 11 inch rotors, and
reaction arms on the four rear rotors. I prefer using the standard master
cylinder, BUT, YOU GOT TO CHECK THE FLUID OFTEN IF YOU USE IT instead of
the P-30. Convert your original distribution valve to all disc, or replace
it with an all disc valve.
The trade off with this all disc system is no parking brake. I have
never set my parking brake since the first time I drove the coach after I
bought it. The cables were rusty and sticky and did not release after I
applied them. I very soon had smoking rear brakes. After several attempts
to repair them, including new rear cables, and a pulley system on the
forward cable, I quit pulling on the parking brake.
Reaction arm brakes will make your coach stop like a modern
automobile, and make everything in your coach that is not nailed down
subject to movement.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Feb 9, 2018 5:44 AM, "Johnny Bridges via Gmclist" <
> We put six wheel disks and tru-traks on Stick Miller's second coach,
> replacing the big mid wheel disk that Lee Haeeison provrided. I don't
> think it
> made a great difference either way. Around here, rear drums with reaction
> arms do as well for less money. The rear disks >might< have an advantage
> in the mountains.
>
> --johnny
> --
> 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> "I forgive them all, save those who hurt the dogs. They must answer to me
> in hell" - ol Andy, paraphrased
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> Jim,
>
> Some states require a mechanically actuated emergency brake. That's why I left the drums on the rears when I first registered it in
> New Jersey.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
What any number of owners have not included in their thinking is that if the case that you take a hit to a drive axle, the final drive or the
transmission after the direct clutch (where the parking pawl is), you could have no way to stop the vehicle from rolling if it chose to do so.
I did have my parking brake working, and it can be done.
Matt
--
Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit
>
> Some states require a mechanically actuated emergency brake. That's why I left the drums on the rears when I first registered it in
> New Jersey.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
What any number of owners have not included in their thinking is that if the case that you take a hit to a drive axle, the final drive or the
transmission after the direct clutch (where the parking pawl is), you could have no way to stop the vehicle from rolling if it chose to do so.
I did have my parking brake working, and it can be done.
Matt
--
Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit
I work on these coaches all the time. If an owner wants his parking brake
to work, then it gets Albert B's kit. Then they work marginally well, as a
parking brake. Emergency brake? Not so much. But you absolutely MUST
EXERCIZE the cables. Sitting a long time with the parking brake set will
almost guarantee dragging brakes. I have read the D.O.T. mandate on
emergency/parking brakes. They must be a whole separate system, applied by
hand or foot. A line lock hydraulic system is not approved. So, I don't
install them. Wheel chocks work quite well. Owners can do to their own
coaches whatever they choose and feel confident with. Me, I don't want the
liability.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
> > Jim,
> >
> > Some states require a mechanically actuated emergency brake. That's why
> I left the drums on the rears when I first registered it in
> > New Jersey.
> >
> > Regards,
> > Rob M.
> > The Pedantic Mechanic
>
> What any number of owners have not included in their thinking is that if
> the case that you take a hit to a drive axle, the final drive or the
> transmission after the direct clutch (where the parking pawl is), you
> could have no way to stop the vehicle from rolling if it chose to do so.
>
> I did have my parking brake working, and it can be done.
>
> Matt
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
to work, then it gets Albert B's kit. Then they work marginally well, as a
parking brake. Emergency brake? Not so much. But you absolutely MUST
EXERCIZE the cables. Sitting a long time with the parking brake set will
almost guarantee dragging brakes. I have read the D.O.T. mandate on
emergency/parking brakes. They must be a whole separate system, applied by
hand or foot. A line lock hydraulic system is not approved. So, I don't
install them. Wheel chocks work quite well. Owners can do to their own
coaches whatever they choose and feel confident with. Me, I don't want the
liability.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
> > Jim,
> >
> > Some states require a mechanically actuated emergency brake. That's why
> I left the drums on the rears when I first registered it in
> > New Jersey.
> >
> > Regards,
> > Rob M.
> > The Pedantic Mechanic
>
> What any number of owners have not included in their thinking is that if
> the case that you take a hit to a drive axle, the final drive or the
> transmission after the direct clutch (where the parking pawl is), you
> could have no way to stop the vehicle from rolling if it chose to do so.
>
> I did have my parking brake working, and it can be done.
>
> Matt
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
Jim,
Dave Lenzi's new middle wheel disk system includes a hydraulic lock system that works.
A brake lever applies pressure to HEAVY spring which in turn presses on a hydraulic cylinder which applies pressure to a modified VW
front disk caliper.
As the brake system cools down the spring maintains pressure in cylinder and on the caliper.
Hopefully he'll bring it to Tucson so you can check it out.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of James Hupy
Sent: Saturday, February 10, 2018 11:03 AM
To: gmclist
Subject: Re: [GMCnet] Six wheel disks?
I work on these coaches all the time. If an owner wants his parking brake
to work, then it gets Albert B's kit. Then they work marginally well, as a
parking brake. Emergency brake? Not so much. But you absolutely MUST
EXERCIZE the cables. Sitting a long time with the parking brake set will
almost guarantee dragging brakes. I have read the D.O.T. mandate on
emergency/parking brakes. They must be a whole separate system, applied by
hand or foot. A line lock hydraulic system is not approved. So, I don't
install them. Wheel chocks work quite well. Owners can do to their own
coaches whatever they choose and feel confident with. Me, I don't want the
liability.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
Dave Lenzi's new middle wheel disk system includes a hydraulic lock system that works.
A brake lever applies pressure to HEAVY spring which in turn presses on a hydraulic cylinder which applies pressure to a modified VW
front disk caliper.
As the brake system cools down the spring maintains pressure in cylinder and on the caliper.
Hopefully he'll bring it to Tucson so you can check it out.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of James Hupy
Sent: Saturday, February 10, 2018 11:03 AM
To: gmclist
Subject: Re: [GMCnet] Six wheel disks?
I work on these coaches all the time. If an owner wants his parking brake
to work, then it gets Albert B's kit. Then they work marginally well, as a
parking brake. Emergency brake? Not so much. But you absolutely MUST
EXERCIZE the cables. Sitting a long time with the parking brake set will
almost guarantee dragging brakes. I have read the D.O.T. mandate on
emergency/parking brakes. They must be a whole separate system, applied by
hand or foot. A line lock hydraulic system is not approved. So, I don't
install them. Wheel chocks work quite well. Owners can do to their own
coaches whatever they choose and feel confident with. Me, I don't want the
liability.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
And if there is any kind of leak in the hydraulic system????
Gary Kosier
77PB w/500Cad
Newark, Ohio
--------------------------------------------------
From: "Rob Mueller"
Sent: Friday, February 09, 2018 7:39 PM
To:
Subject: Re: [GMCnet] Six wheel disks?
> Jim,
>
> Dave Lenzi's new middle wheel disk system includes a hydraulic lock system
> that works.
>
> A brake lever applies pressure to HEAVY spring which in turn presses on a
> hydraulic cylinder which applies pressure to a modified VW
> front disk caliper.
>
> As the brake system cools down the spring maintains pressure in cylinder
> and on the caliper.
>
> Hopefully he'll bring it to Tucson so you can check it out.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces] On Behalf Of James
> Hupy
> Sent: Saturday, February 10, 2018 11:03 AM
> To: gmclist
> Subject: Re: [GMCnet] Six wheel disks?
>
> I work on these coaches all the time. If an owner wants his parking brake
> to work, then it gets Albert B's kit. Then they work marginally well, as a
> parking brake. Emergency brake? Not so much. But you absolutely MUST
> EXERCIZE the cables. Sitting a long time with the parking brake set will
> almost guarantee dragging brakes. I have read the D.O.T. mandate on
> emergency/parking brakes. They must be a whole separate system, applied by
> hand or foot. A line lock hydraulic system is not approved. So, I don't
> install them. Wheel chocks work quite well. Owners can do to their own
> coaches whatever they choose and feel confident with. Me, I don't want the
> liability.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Gary Kosier
77PB w/500Cad
Newark, Ohio
--------------------------------------------------
From: "Rob Mueller"
Sent: Friday, February 09, 2018 7:39 PM
To:
Subject: Re: [GMCnet] Six wheel disks?
> Jim,
>
> Dave Lenzi's new middle wheel disk system includes a hydraulic lock system
> that works.
>
> A brake lever applies pressure to HEAVY spring which in turn presses on a
> hydraulic cylinder which applies pressure to a modified VW
> front disk caliper.
>
> As the brake system cools down the spring maintains pressure in cylinder
> and on the caliper.
>
> Hopefully he'll bring it to Tucson so you can check it out.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces] On Behalf Of James
> Hupy
> Sent: Saturday, February 10, 2018 11:03 AM
> To: gmclist
> Subject: Re: [GMCnet] Six wheel disks?
>
> I work on these coaches all the time. If an owner wants his parking brake
> to work, then it gets Albert B's kit. Then they work marginally well, as a
> parking brake. Emergency brake? Not so much. But you absolutely MUST
> EXERCIZE the cables. Sitting a long time with the parking brake set will
> almost guarantee dragging brakes. I have read the D.O.T. mandate on
> emergency/parking brakes. They must be a whole separate system, applied by
> hand or foot. A line lock hydraulic system is not approved. So, I don't
> install them. Wheel chocks work quite well. Owners can do to their own
> coaches whatever they choose and feel confident with. Me, I don't want the
> liability.
> Jim Hupy
> Salem, Or
> 78 GMC ROYALE 403
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
I was talking on the phone with Dave Lenzi today. He will have it at Tucson.
Emery Stora
77 Kingsley
Frederick, CO
>
> And if there is any kind of leak in the hydraulic system????
>
> Gary Kosier
> 77PB w/500Cad
> Newark, Ohio
>
> --------------------------------------------------
> From: "Rob Mueller"
> Sent: Friday, February 09, 2018 7:39 PM
> To:
> Subject: Re: [GMCnet] Six wheel disks?
>
>> Jim,
>>
>> Dave Lenzi's new middle wheel disk system includes a hydraulic lock system that works.
>>
>> A brake lever applies pressure to HEAVY spring which in turn presses on a hydraulic cylinder which applies pressure to a modified VW
>> front disk caliper.
>>
>> As the brake system cools down the spring maintains pressure in cylinder and on the caliper.
>>
>> Hopefully he'll bring it to Tucson so you can check it out.
>>
>> Regards,
>> Rob M.
>> The Pedantic Mechanic
>> Sydney, Australia
>> AUS '75 Avion - The Blue Streak TZE365V100428
>> USA '75 Avion - Double Trouble TZE365V100426
>> USA '77 Kingsley - TZE 267V100808
>>
>>
>> -----Original Message-----
>> From: Gmclist [mailto:gmclist-bounces] On Behalf Of James Hupy
>> Sent: Saturday, February 10, 2018 11:03 AM
>> To: gmclist
>> Subject: Re: [GMCnet] Six wheel disks?
>>
>> I work on these coaches all the time. If an owner wants his parking brake
>> to work, then it gets Albert B's kit. Then they work marginally well, as a
>> parking brake. Emergency brake? Not so much. But you absolutely MUST
>> EXERCIZE the cables. Sitting a long time with the parking brake set will
>> almost guarantee dragging brakes. I have read the D.O.T. mandate on
>> emergency/parking brakes. They must be a whole separate system, applied by
>> hand or foot. A line lock hydraulic system is not approved. So, I don't
>> install them. Wheel chocks work quite well. Owners can do to their own
>> coaches whatever they choose and feel confident with. Me, I don't want the
>> liability.
>> Jim Hupy
>> Salem, Or
>> 78 GMC ROYALE 403
>>
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> _______________________________________________
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Emery Stora
77 Kingsley
Frederick, CO
>
> And if there is any kind of leak in the hydraulic system????
>
> Gary Kosier
> 77PB w/500Cad
> Newark, Ohio
>
> --------------------------------------------------
> From: "Rob Mueller"
> Sent: Friday, February 09, 2018 7:39 PM
> To:
> Subject: Re: [GMCnet] Six wheel disks?
>
>> Jim,
>>
>> Dave Lenzi's new middle wheel disk system includes a hydraulic lock system that works.
>>
>> A brake lever applies pressure to HEAVY spring which in turn presses on a hydraulic cylinder which applies pressure to a modified VW
>> front disk caliper.
>>
>> As the brake system cools down the spring maintains pressure in cylinder and on the caliper.
>>
>> Hopefully he'll bring it to Tucson so you can check it out.
>>
>> Regards,
>> Rob M.
>> The Pedantic Mechanic
>> Sydney, Australia
>> AUS '75 Avion - The Blue Streak TZE365V100428
>> USA '75 Avion - Double Trouble TZE365V100426
>> USA '77 Kingsley - TZE 267V100808
>>
>>
>> -----Original Message-----
>> From: Gmclist [mailto:gmclist-bounces] On Behalf Of James Hupy
>> Sent: Saturday, February 10, 2018 11:03 AM
>> To: gmclist
>> Subject: Re: [GMCnet] Six wheel disks?
>>
>> I work on these coaches all the time. If an owner wants his parking brake
>> to work, then it gets Albert B's kit. Then they work marginally well, as a
>> parking brake. Emergency brake? Not so much. But you absolutely MUST
>> EXERCIZE the cables. Sitting a long time with the parking brake set will
>> almost guarantee dragging brakes. I have read the D.O.T. mandate on
>> emergency/parking brakes. They must be a whole separate system, applied by
>> hand or foot. A line lock hydraulic system is not approved. So, I don't
>> install them. Wheel chocks work quite well. Owners can do to their own
>> coaches whatever they choose and feel confident with. Me, I don't want the
>> liability.
>> Jim Hupy
>> Salem, Or
>> 78 GMC ROYALE 403
>>
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
I've always had serious qualms about any hydraulic-based parking brake
system because of the dramatic effect even a small fluid leak can have.
Dave's spring loaded system will probably overcome some of that problem.
But I think my system may be even better:
Several years ago, when the EBC Yellow brake pads first became available, I
wanted to do controlled tests on them. So, I fabricated a "brake pedal
puller" to mount beneath the GMC floorboard under the brake pedal. A chain
attaches the brake pedal to a pneumatic cylinder. Using a solenoid valve
system and a large air tank, to provide regulated pressure to that cylinder
on command, we were able to get some pretty well controlled test results --
the system even fired a paint ball on the pavement where the brake lights
came one.
A few years later, I realized one day that I'd never removed the "pedal
puller". Since I'd recently acquired a tiny Thomas air compressor, capable
of 100+ psi, it occurred to me that the two of them should work together
for some good purpose. What I wound up with is a 6-wheel (or 10-wheel if
towing) parking brake system. A dash switch activates the compressor to
produce 100 psi, pressure switch regulated. That 100 psi results in 140
lbf of brake pedal force. The compressor will maintain that pressure until
the engine battery runs dead -- a LONG time since, even with minor leakage,
the compressor runs for maybe 2 seconds out of every minute. Granted, a
hydraulic leak will also cause brake failure -- but only after it's leaked
the pedal all the way to the floor (in both the front and rear brake
systems). To release the brake, the dash switch is turned off, removing
power to the compressor, and to the normally-open solenoid valve which
dumps the trapped pressure.
It's really quite simple system and is very effective -- even without
vacuum boost, that 140 lbf on the brake pedal is darned effective with the
coach already stopped. It will even give a pretty dramatic stop with the
engine running.
Just another idea to consider -- even if not a "legal" one for satisfaction
of DOT rules.
Ken H.
> >
> > And if there is any kind of leak in the hydraulic system????
> >
>
system because of the dramatic effect even a small fluid leak can have.
Dave's spring loaded system will probably overcome some of that problem.
But I think my system may be even better:
Several years ago, when the EBC Yellow brake pads first became available, I
wanted to do controlled tests on them. So, I fabricated a "brake pedal
puller" to mount beneath the GMC floorboard under the brake pedal. A chain
attaches the brake pedal to a pneumatic cylinder. Using a solenoid valve
system and a large air tank, to provide regulated pressure to that cylinder
on command, we were able to get some pretty well controlled test results --
the system even fired a paint ball on the pavement where the brake lights
came one.
A few years later, I realized one day that I'd never removed the "pedal
puller". Since I'd recently acquired a tiny Thomas air compressor, capable
of 100+ psi, it occurred to me that the two of them should work together
for some good purpose. What I wound up with is a 6-wheel (or 10-wheel if
towing) parking brake system. A dash switch activates the compressor to
produce 100 psi, pressure switch regulated. That 100 psi results in 140
lbf of brake pedal force. The compressor will maintain that pressure until
the engine battery runs dead -- a LONG time since, even with minor leakage,
the compressor runs for maybe 2 seconds out of every minute. Granted, a
hydraulic leak will also cause brake failure -- but only after it's leaked
the pedal all the way to the floor (in both the front and rear brake
systems). To release the brake, the dash switch is turned off, removing
power to the compressor, and to the normally-open solenoid valve which
dumps the trapped pressure.
It's really quite simple system and is very effective -- even without
vacuum boost, that 140 lbf on the brake pedal is darned effective with the
coach already stopped. It will even give a pretty dramatic stop with the
engine running.
Just another idea to consider -- even if not a "legal" one for satisfaction
of DOT rules.
Ken H.
> >
> > And if there is any kind of leak in the hydraulic system????
> >
>
I have a pair of 20 inch 4x4 treated blocks which constitute the 'parking brake'. Never tried the handle, I was told it worked when I got the coach,
but it has one of Ragusa's extensions to make it easier to set - and bend things if something sticks. Should I want or need the handbrake, I'll add
pulleys per Tom Pryor in place of the slides.
--johnny
--
76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased
but it has one of Ragusa's extensions to make it easier to set - and bend things if something sticks. Should I want or need the handbrake, I'll add
pulleys per Tom Pryor in place of the slides.
--johnny
--
76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased
