As long as you bolt the unit up to the firewall and extend the swing pedal
support bracket to mount to the dash to distribute the brake pedal pressure
you really don't need an additional plate on the firewall.
I solved my leaning master cylinder problem by making up a spacer bushing to
place between the booster and firewall to level the master cylinder. I
would recommend against mixing the firebird and Camaro components.
The proportioning valves are setup for the weight characteristics of the
cars and sometimes its better to just remove it and start from scratch. By
that I mean you check to see if the residual pressure valves are located in
the master cylinder outlet ports by pushing something inside the small
outlet port to feel the spring loaded valve. If they are their, you'll just
need to purchase and install a 10 lb aftermarket residual valve on the line
going toward the front brakes (because it only has a 2 lb valve for the disc
brake from the factory). You'll then have the correct pressure at all the
If after driving the truck you have unequal braking (back brakes locking up
before the front) you can purchase an adjustable proportioning valve and
install it in the rear line.
All you have to do for the mechanical brake light switch is check to see
which two wires pass current when the switch is depressed and wire it into
the electrical system as before.
I installed a firewall mounted power brake unit in my 1950 Chevy with the
adjustable proportioning valve and residual valves two years ago and haven't
had a single problem.
1950 Chevrolet 3100
Yuba City, Ca
----- Original Message -----
From: Brian m <firstname.lastname@example.org>
To: <Passnb4U@aol.com>; <email@example.com>
Sent: Saturday, May 06, 2000 2:25 PM
Subject: Re: [oletrucks] master cylinders
> hi all
> well, i went to pick-in-pulls half off day today. got a power booster,
> assy. and master cylinder from an 85 camaro. but becuase the M/C is at
> an angle, i also got a M/C from a 77 firebird. both have proportioning
> valves (are they needed if im useing 4 drums?) ive held it all in place,
> from the way it looks, it should fit perfectly. the pedal hangs to about
> where the stock pedal is (but a lil more to the left, as the arm is on the
> left side of the colume) and the booster and M/C line up nice on the
> side, the lower left hand bolt on the dash support looks like it will be
> used to hold one of 4 courners of the M/C and pedals up. is this a good
> idea? what about this plate on the motor side? welding it up is no
> as i have access to welders. but id rather not weld if i dont have to.
> i got a brake light switch that works mechanically, and it has 4 wires in
> it, im assuming 2 are for the brake lights, and 2 are for cruise control,
> but which is which, all i remember of the colors are that one swtich is
> and orange, and the other two are some other colors i forget.
> Atwater, CA
> '57 chevy 3200
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959