Brake pedal travel

[Jim Hupy]

In a stock unmolested brake system in a GMC MOTORHOME, the front reservoir
is for the rear brakes, and the back reservoir is for the front disc
brakes, as the front pads wear, the level in the reservoir drops
accordingly. I don't believe that is what is happening on this particular
coach. NEVER ASSUME ANY FLUID LOSS IS NORMAL. VERIFY WHAT IS GOING ON.
YOUR LIFE AND LIVES OF OTHERS, MAY DEPEND UPON IT.
JIM HUPY
Salem, Or
78 GMC ROYALE 403

> > Anytime you lose fluid in the master cylinder reservoir, you have a
> leak. ...
> As the front pads wear, the fluid in its reservoir drops. On the OEM
> system, the front reservoir is the rear brakes. If the system has been
> altered so
> that the front reservoir is the front brakes, there is a good chance a
> drop in fluid means nothing except that the pads are wearing.
>
> Hard to diagnose anything on a 40 yo vehicle (that may not be all OEM)
> without complete information.
> --
> 73 23' Sequoia 4 Sale
> 73 23' CanyonLands Parts Unit 4 Sale
> Upper Alabama
> "Highest price does not guarantee highest quality."
>
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[a.]

> In a stock unmolested brake system in a GMC MOTORHOME, the front reservoir
> is for the rear brakes, and the back reservoir is for the front disc
> brakes, as the front pads wear, the level in the reservoir drops
> accordingly. I don't believe that is what is happening on this particular
> coach. NEVER ASSUME ANY FLUID LOSS IS NORMAL. VERIFY WHAT IS GOING ON.
> YOUR LIFE AND LIVES OF OTHERS, MAY DEPEND UPON IT.
> JIM HUPY
> Salem, Or
> 78 GMC ROYALE 403
Yep. Better safe than sorry, or worse.

Mostly I wanted to clarify that the fluid level in a reservoir that feeds disc brakes will drop without a leak. That's how they "self-adjust".

Now I don't know if the one that started this discussion has rear drums or discs, or if the lines have been reversed or the shoes are not
self-adjusting and one or more wheel cylinders are not being pulled back (cylinder holding extra fluid).

Fluid needs to be replenished as discs wear, and drums need to be serviced if the reservoir needs fluid.

Just trying to stop a noob from panicking if the reservoir for disc brakes needs fluid.
--
73 23' Sequoia 4 Sale
73 23' CanyonLands Parts Unit 4 Sale
Upper Alabama
"Highest price does not guarantee highest quality."

 

[randy1]

Thanks for the description of which reservoir feeds which brakes. I'll check for a leaking wheel cylinder in the back.
--
Randy
1973 26' Painted Desert
Ahwatukee (Phoenix) AZ

 

[randy1]

Looked under the coach for signs of fluid leaking out of any of the cylinders. Could fluid be in the booster?

--
Randy
1973 26' Painted Desert
Ahwatukee (Phoenix) AZ

 

[LQQKatJon]

Yes.

but I don't think you can really be sure you are not loosing fluid out the rear brake cylinders unless you pull the drum.

--
Jon Roche
75 palm beach
St. Cloud, MN
http://lqqkatjon.blogspot.com/