thanks Dave Lenzi

[ekbyker]

Thank you Dave Lenzi for fixing my brakes I know you hane not been near my coach but your artical in the last GMC vintage rv was the answer .Two years
ago I did a major brake rebuild 4 new rear wheel cyls rear shoes ss flex lines new BRASS combination valve new master cyl new sensitied booster new
yellow pads ( po had instaled 80 mm calipers ) I spent hours bleeding trying to get good brakes spet time on the phone with Jim k I could not get the
rear wheels to lock up . The next winter I converted to a home built hydroboost ( a big improvement )but still no rear lock up . To day I modified the
new BRASS combination valve as per Daves instructions went for a Quick road test I can finalay lock the rear wheels thanks Dave

 

[Tom Katzenberger]

Does the new combination valve sold by Applied correct for this or should it be modified as well?
--
Tom & Oki Katzenberger,
Kingsville, Maryland,
1977 23' Birchaven, 455 C.I.D.

 

[billvv]

I think the only way to be sure is to take one apart or ask Applied.
--
Bill Van Vlack
'76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath, Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o mid
November 2015.

 

[ekbyker]

mine was bought from Jim K he needs to chime in

 

[mark sawyer]

Why are you trying to lock your rear wheels?

--
Mark S. '73 Painted Desert,
Manny 1 Ton Front End,
Howell Injection,
Leigh Harrison 4bag and Rear Brakes,
Fort Worth, TX

 

[ekbyker]

I do not want to ever need to lock the rear wheels I just need to know that in an emergency ( eg dum driver cuts me off )that I have maxinum braking
available

 

[Jim Hupy]

Sorry to inform you of this, but wheels locked does not represent maximum
braking effort.
Jim Hupy
Salem, Oregon

> I do not want to ever need to lock the rear wheels I just need to know
> that in an emergency ( eg dum driver cuts me off )that I have maxinum
> braking
> available
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>

 

[mark sawyer]

> I do not want to ever need to lock the rear wheels I just need to know that in an emergency ( eg dum driver cuts me off )that I have maxinum
> braking available

But if your backs are locking prematurely, your fronts may not be getting max braking.... And the fronts are responsible for the vast majority of
braking force in a panic stop.

My point being make sure your focus is on the fronts... Yes it's good to maximize rear braking, but not at the expense of front braking performance.
And if you are locking the backs before the front, you very well may be.

--
Mark S. '73 Painted Desert,
Manny 1 Ton Front End,
Howell Injection,
Leigh Harrison 4bag and Rear Brakes,
Fort Worth, TX

 

[Ken H.]

True, but if you can't lock them, how do you know you have the braking
capacity to reach that maximum just before lock-up?

Ken "Just barely can" H.

> Sorry to inform you of this, but wheels locked does not represent maximum
> braking effort.
> Jim Hupy
> Salem, Oregon
>

>
> > I do not want to ever need to lock the rear wheels I just need to know
> > that in an emergency ( eg dum driver cuts me off )that I have maxinum
> > braking
> > available
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>

 

[gmcnet1]

According to Mr. Lenzi, the mid-brakes on a 26' coach deliver comparable braking power to the fronts, unlike on a car. The difference is the length of
the coach and the lever action of the front bogie arms.
--
Christo Darsch
GMC Nor'easters
1977 Eleganza II - "The Komet"
3.50 Power Drive, Disc Brakes, Alcoas
Weymouth, MA

 

[RF_Burns]

If you read DaveL's article in a recent GMCMI magazine, you will know what ebyker is talking about.

The OEM brake valve did not limit the pressure to the rear brakes while the replacement brass valves do. They are made for cars and light trucks that
do not have much weight on the rear end, so the rear brake pressure was limited to about 70% (~700-800psi if I recall). Our rear heavy coaches do not
need this pressure limiting so it was not an OEM valve feature.

His article shows how to identify the valves and remove the pressure limiting parts and get full brake pressure to the rear brakes again.

--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

 

[6cuda61]

Lock up or no lock up i can tell you when these brakes are set up and working properly you can make 2 one hundred pound shepards and a ninety pound
rotty fly from the back clean to cockpit floor without even a touch of wheel skid.....lol.
--
Rich Mondor,

Brockville, ON

77 Hughes 2600