By trying to run rear discs with front drums I think you opening youself
up to a lot of problems. I would suggest that you go to a junkyard and
get the whole rear drum setup off a 79-81 firebird. I don't know for
sure but GM was never one for making 2 parts where one will do and
probly used the same axle housing just bolted different brakes on the
end.
Just a point of clarification, drum brakes have a residual pressure
valve to keep the cups in the wheel cylinders seated, disc brakes use a
o-ring type seal and seal tension keeps the pads against the rotor. If
you use a drum brake residual pressure valve master cylinder on disc
brakes it will wear the pads off in short order. Some disc conversion
systems use a specially designed residual valve as an anti-backflow
valve when the master cylinder is lower than the calipers.
Good luck,
John
Bob bdfentr wrote:
>
> Several questions have now reared their ugly head, and I do not wish to be
>critical nor do I wish to be taken as such. No abuse intended so please bear
>with me. The wrong system setup could prove to be a problem.
>
> 1: What proportioning valve are you going to use?
> 2: Where is the master cylinder located?
> 3: What are the front/rear proportioning valve ratios going to be?
> 4: Are you going to use and adjustable proportioning valve?
> 5: Do you have a safe place to test the brakes when adusting the valve?
> 6: Are you going to use a split piston modern master cylinder?
>
>
>
> ---------- Original Message ----------------------------------
> From: MPHUDAK@aol.com
> Reply-To: MPHUDAK@aol.com
> Date: Mon, 22 Mar 1999 18:28:30 EST
>
> >I'm in a bit of a pinch and was wondering what my best options are. I have a
> >79-81 firebird rear end, 10-bolt posi w/disc brakes. The problem I have is
> >that I need to replace the calipers on both sides do to the pistons being
> >seized in place. First of all I was wondering if anyone had any calipers out
> >there, in good shape, that they are willing to part with for this rear. Or
> >option two, is it possible to convert this rear to a drum style brake system?
> >Last question, I am going to keep the front drum brakes until I replace the
> >chassis, what unforeseen problems am I going to run into using drum front and
> >disc rear?
> >
> >TIA,
> >Hudak
> >2-54 3100
> >57 3100
> >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
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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