first problem is that if you have a 3800 it is a one ton instead of a 3/4
ton. You may not be able to find shoes but may have to have the old ones
Second problem is that the '73 master cylinder is for a disc/drum system.
The two different sized lines are so the front and the rear can't get mixed
up. Using this master cylinder the front brakes won't have a residual
pressure applied to them and may cause the cylinders to leak.
I used a master cylinder from a '68 chevy one ton on mine before I changed
to disc on the front.
1950 chevy 3800 panel
1952 GMC 640 firetruck
> I am trying to redo the brakes on my 1957 3800. My parts man shows all
> ton brake shoes as 11" x 2", but my rear drums seem to measure at 12" x
> think I am meaasuring correct (across the drum) but someone please verify.
> Also, I have added an adapter kit for the master cylinder and I installed
> new master cylinder that lists for a 1973 1/2 ton Chevy with manual
> Once installed I found that the fittings for the two brake line outlets
> not identical. Which one should go to the fronts and which to the back?
> Also, what is the purpose of the large concentric bolt that the brake
> pivot on? Why is it concentric?
> Thanks for any help or suggestions you may have.
> Rick in Iowa
> 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