Parking Brake

D

dave lowry

New member
Jul 7, 1998
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Hey Zak,

I thought drag racers used a positive brake lock which they engage when
staged and release (automatically) when they hit the throttle? Wouldn't
such a device work on our GMC's?

Such might be an alternative to a "gadget" from JCW.

Whadaya think?

Dave (& Dege), Santa Barbara, '76 Royale 26'
 
There are 3 of them listed in the summit catalog:

1. BRP Biondo racing products par5t # SBR-LL for $49.95
2. TCI line lock part # TCI-861700 for $69.95
3. hurwst roll control part # HUU-1745000 for $107.95

go for it!

>Hey Zak,
>
>I thought drag racers used a positive brake lock which they engage when
>staged and release (automatically) when they hit the throttle? Wouldn't
>such a device work on our GMC's?
>
>Such might be an alternative to a "gadget" from JCW.
>
>Whadaya think?
>
>Dave (& Dege), Santa Barbara, '76 Royale 26'
>
>
>
>
Tom & Marg Warner
Vernon Center NY
1976 palmbeach
 
Dave,

Yes, we have a "line-lock" which locks the pressure you are applying with
the foot brake on our Firebird. You can then release the foot brake and
the pressure stays as long as you keep the line-lock activated. Some
racers use them to hold the car still on the starting line. We only one
for the front brakes of the Firebird to lock the fronts to make burnouts
easier. They are usually activated with a button. Ours is just a
pushbutton that we have to let go when we want them to release, while
Pro-Stocks have them mounted to the clutch so they release automatically
when they let the clutch out.

They could be used as a parking brake but not as an emergency brake.
Unfortunately most of them have very small diameter passages. They would
also have to be energized (drawing power) to keep the pressure locked in
(at least the ones the racers use). I don't think that these solenoids are
rated for continuous use like that. One other thing I should mention about
line-locks is that if they are inadvertently energized, they also lock
pressure out. That could really be a problem if someone turned the switch
on by accident. Pushing on the brake pedal would do nothing because the
line-lock would be locking out the pressure just as well as it would
normally lock it in.

Zak

PS - The following is just to give you guys some information and has no
real GMC value. The powerglide transmissions in our race cars have
trans-brakes for keeping the car on the starting line. These are solenoids
that apply both first gear and reverse at the same time. That allows us to
go full throttle (~6500 RPM) on the converter without moving at all. When
the solenoid is released, it dumps the fluid that was keeping reverse
applied and the car launches immediately since first gear is already
applied. This allows the cars to react VERY quickly.

>Hey Zak,
>
>I thought drag racers used a positive brake lock which they engage when
>staged and release (automatically) when they hit the throttle? Wouldn't
>such a device work on our GMC's?
>
>Such might be an alternative to a "gadget" from JCW.
>
>Whadaya think?
>
>Dave (& Dege), Santa Barbara, '76 Royale 26'
>
 
Thanks for the info, Tom. I'll check these out.

And thanks also to Zak. Now I'll also know what not to get.

Q. Should I be including my original question and the responses every time,
or is is better to assume folks remember what's being discussed or can
review prior posts on the same subject,and thus keep posts short?

Dave (& Dege), Santa Barbara, '76 Royale 26'
 
The brake lock that we use on ground equipment at the airport does not draw
power to remain locked. We wire them to the ignition switch so when the
ignition is off so is the power to the brake lock. To activate the lock you
flip the switch to on (which powers a solenoid) and then apply the brakes.
A check valve keeps the brakes applied until you hit the brakes again (with
the switch in the off position or I think with the ignition switch off (I
will try to check that ignition switch off senero when I go back to the
airport)). They also make one that is a manual operated valve. Both of
these parts are available from NAPA. I don't have the part numbers handy
but can get them if someone wants them. I have posted them to the net in
the past.

I would not recommend that you use them as your sole means of holding the
GMC in one spot. They can leak down and allow the vehicle move if it is on
a hill.(we don't have many hills on the airport ramp.) They will work for
short time application (a few hours) but the best thing to use along with
the brake lock is wheel chocks. 4"x4" blocks about a foot long work real
good for wheel chocks. You can also use them under the center casting of
the rear bogy for support so you can let the air pressure out of your air
bags when parking for any extended time.

Russ Bethel
grbethel
 
I would like the information and any drawings you might have on installation
and operation.
Thanks
Al Chernoff

> The brake lock that we use on ground equipment at the airport does not draw
> power to remain locked. We wire them to the ignition switch so when the
> ignition is off so is the power to the brake lock. To activate the lock you
> flip the switch to on (which powers a solenoid) and then apply the brakes.
> A check valve keeps the brakes applied until you hit the brakes again (with
> the switch in the off position or I think with the ignition switch off (I
> will try to check that ignition switch off senero when I go back to the
> airport)). They also make one that is a manual operated valve. Both of
> these parts are available from NAPA. I don't have the part numbers handy
> but can get them if someone wants them. I have posted them to the net in
> the past.
>
> I would not recommend that you use them as your sole means of holding the
> GMC in one spot. They can leak down and allow the vehicle move if it is on
> a hill.(we don't have many hills on the airport ramp.) They will work for
> short time application (a few hours) but the best thing to use along with
> the brake lock is wheel chocks. 4"x4" blocks about a foot long work real
> good for wheel chocks. You can also use them under the center casting of
> the rear bogy for support so you can let the air pressure out of your air
> bags when parking for any extended time.
>
> Russ Bethel
> grbethel
 
Electric operated NAPA part number 57515
Manual operated NAPA part number 57504

They go in series in the main brake line going to the rear wheels. They
come with a low pressure warning switch that will warn you when the trapped
pressure falls below a certain pressure. I would scan the directions but I
am having computer problems and the scanner is not working. I could either
fax a copy of the directions to you or make a copy of them and snail mail
them to you. Let me know.

We use the electric operated setup most of the time as it is easy to
install.

Russ Bethel
grbethel

- -----Original Message-----
From: mr.c
To: gmcmotorhome
Date: Saturday, February 27, 1999 23:54 PM
Subject: Re: GMC: Parking Brake

>I would like the information and any drawings you might have on
installation
>and operation.
>Thanks
>Al Chernoff
 
My fax number is 505-821-2325. Sounds interesting. The parking brakes on my
rig do not work and everyone I hear about has the same problems.
Al Chernoff
77 Eleganza II

> Electric operated NAPA part number 57515
> Manual operated NAPA part number 57504
>
> They go in series in the main brake line going to the rear wheels. They
> come with a low pressure warning switch that will warn you when the trapped
> pressure falls below a certain pressure. I would scan the directions but I
> am having computer problems and the scanner is not working. I could either
> fax a copy of the directions to you or make a copy of them and snail mail
> them to you. Let me know.
>
> We use the electric operated setup most of the time as it is easy to
> install.
>
> Russ Bethel
> grbethel
>
> -----Original Message-----
> From: mr.c
> To: gmcmotorhome
> Date: Saturday, February 27, 1999 23:54 PM
> Subject: Re: GMC: Parking Brake
>
> >I would like the information and any drawings you might have on
> installation
> >and operation.
> >Thanks
> >Al Chernoff
 
I will bring the sheets to work with me on Wednesday morning and fax them to
you then. I have to fly to Louisville, KY in the morning after I get off
work (I work midnight to 8am) and hope to be home tomorrow night. I will
not be back to work where the fax machine is until Wednesday morning
(midnight Tuesday night). I hope they help you.

Russ Bethel
grbethel

- -----Original Message-----
From: mr.c
To: gmcmotorhome
Date: Sunday, February 28, 1999 23:46 PM
Subject: Re: GMC: Parking Brake

>My fax number is 505-821-2325. Sounds interesting. The parking brakes on
my
>rig do not work and everyone I hear about has the same problems.
>Al Chernoff
>77 Eleganza II
>

>
>> Electric operated NAPA part number 57515
>> Manual operated NAPA part number 57504
>>
>> They go in series in the main brake line going to the rear wheels. They
>> come with a low pressure warning switch that will warn you when the
trapped
>> pressure falls below a certain pressure. I would scan the directions but
I
>> am having computer problems and the scanner is not working. I could
either
>> fax a copy of the directions to you or make a copy of them and snail mail
>> them to you. Let me know.
>>
>> We use the electric operated setup most of the time as it is easy to
>> install.
>>
>> Russ Bethel
>> grbethel
>>
>> -----Original Message-----
>> From: mr.c
>> To: gmcmotorhome
>> Date: Saturday, February 27, 1999 23:54 PM
>> Subject: Re: GMC: Parking Brake
>>
>> >I would like the information and any drawings you might have on
>> installation
>> >and operation.
>> >Thanks
>> >Al Chernoff
>
 
>I will bring the sheets to work with me on Wednesday morning and fax them to
>you then. I have to fly to Louisville, KY in the morning after I get off
>work (I work midnight to 8am) and hope to be home tomorrow night. I will
>not be back to work where the fax machine is until Wednesday morning
>(midnight Tuesday night). I hope they help you.

Russ

If you want to, just fax a copy to 915-784-5152 and I'll scan em in and
post em on my site so everyone that wants a copy can save it off the net.

Hope this helps

bdub
'76 Palm Beach
In The Heart o Texas
www.web-access.net/~bmassey/
icq # 202333
 
>In a message dated 3/1/99 4:27:12 AM Central Standard Time,

>
>> I could
>> either
>> >> fax a copy of the directions to you or make a copy of them and snail

If you wouldn't mind sending me a clean copy I'll scan them and put them up
on my site.

Henry
Henry Davis Consulting, Inc / new product consulting
PO Box 1270 / product readiness reviews
Soquel, Ca 95073 / IP reviews
ph: (408) 462-5199 / full service marketing
fax: (408) 462-5198
http://www.henry-davis.com/ http://www.henry-davis.com
 
Tried to fax these to you last night but you must have turned your fax
machine off. I will try again tonight between midnight and 7am.

Russ Bethel
grbethel

>
>Russ,
>I'd appreciate a copy, too. Please fax toll-free to 888-372-5450 or
>877-372-5450.
>Thanks,
>Lanier Foote
>Jackson, MS
>
 
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