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The residual pressure valves should go right after the master cylinder.
The purpose of the valves is to keep a minimum pressure in the lines
when the master cylinder is lower than the wheel cylinders, preventing
the flud from draining back to the master cylinder. The valves should be
2 psi for disc brakes and 10 psi for drum brakes.
Hope this helps.
Don Short
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Date: Mon, 10 May 1999 00:50:05 -0400
From: WR Teto <monadnoc@wgserv.crystal-mtn.com>
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To: Ole Trucks <oletrucks@autox.team.net>
Subject: Re: [oletrucks] Brake connections
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Reply-To: WR Teto <monadnoc@wgserv.crystal-mtn.com>
Dave, the 1/4" line nearest the brake booster goes to the rear brakes,
while the 3/16" line goes to the fronts (after being split into two
3/16" separate lines at the distribution valve). I'm not sure what you
mean by the residual valve. I only have the distribution valve on my 72
Chevelle with 4 drums, but my Haynes Chevelle repair manual which covers
models through 1987 only shows that one valve as well. It's the one
with the electrical switch which is triggered during a failure of one
half of the braking circuit. The manual explains things thusly;
1. Metering valve holds off pressure to the front discs until the rear
drums overcome the force of the springs to ensure even braking.
2. Proportioning valve limits hydraulic pressure to the rear to prevent
them from locking before full braking effort is obtained by the front
discs.
The cut-a-way of the design shows both the metering and proportioning
valves incorporated into the same unit which is the block located either
near the master cylinder or on the firewall. If you get desparate, I
could copy the braking section out of my manual and snail-mail it to you
if you're interested.
Wally / Templeton, MA
53 3100 rod-storation
>
> I am getting ready to hook up the brake lines on my truck. I have disk
> front & drum rear with power dual master cylinder. I have an
> adjustable
> proportioning valve and residual valve for both front and rear. The
> master cylinder will be mounted under the floor.
>
> I am not sure how to hook up the master cylinder. There are two
> outlets,
> one that normally has a 1/4" tube and is closest to the power booster,
> and one that normally has a 3/16" line, furthest from the power
> booster.
> This is a late 70's Chevy master cylinder for disk/drum combination.
> Which one of these outlets is for the front disks and which one for
> the
> rear drums?
>
> Also, should the residual valve for the rear go between the
> proportioning
> valve and the wheel cylinders, or between the proportioning valve and
> the
> master cylinders?
>
> Any help is greatly appreciated.
>
> Thanks,
>
> Dave
> 1950 3100
>
> oletrucks is devoted to Chevy and GM trucks built between 1941 and
> 1959
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