You can still use the disc/drum master cylinder on a drum/drum system but
that's where the proportioning valves and the added residual pressure valve
comes into play. The added residual pressure valves takes over for the
added pressure needed for the drums 10 lb (disc uses a 2 lb valve).
The proportioning valve then fine tunes the braking system for the weight
characteristics of the truck to make sure all brakes apply evenly.
You could just buy a drum/drum master cylinder but your still going to need
the proportioning valve.
Joe Garcia
1950 Chevrolet 3100
1950 Willys Jeepster
Yuba City, Ca
http://chevy1.freeservers.com/
http://jeepster.freeservers.com/
http://50chevy.freeservers.com/
----- Original Message -----
From: ROGER GLEASON <rogerg@maverick.facil.uconn.edu>
To: <oletrucks@autox.team.net>
Sent: Monday, May 08, 2000 6:36 AM
Subject: Re: [oletrucks] master cylinders
> I don't think you can use the master cylinder from a front disc rear
> drum brake system on a 4 wheel brake system due to the different line
> sizes being that they use small lines for the front and large for the
> rear... The system was designed for use with disc on front and the
> fluid needed to push the calipers closed is much less than the amount
> needed for the rear drums.. You need a master cylinder for a drum
> front drum rear.
> rogerg
>
>
>
> > From: "Brian m" <pkupman57@hotmail.com>
> > To: Passnb4U@aol.com, oletrucks@autox.team.net
> > Subject: Re: [oletrucks] master cylinders
> > Date: Sat, 06 May 2000 14:25:25 PDT
> > Reply-to: "Brian m" <pkupman57@hotmail.com>
>
> > hi all
> > well, i went to pick-in-pulls half off day today. got a power booster,
pedal
> > assy. and master cylinder from an 85 camaro. but becuase the M/C is at
such
> > 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,
and
> > 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
engine
> > 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
problem,
> > as i have access to welders. but id rather not weld if i dont have to.
also,
> > 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
blue
> > and orange, and the other two are some other colors i forget.
> > thanks,
> > Brian
> > Atwater, CA
> > '57 chevy 3200
> >
> > oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
> >
> Rogerg
> 51-3100 AD Huckster
> Lisbon, Connecticut
> 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
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