Trying to figure out brake problem with rear disc upgrade

[Apogee]

Originally Posted by CreepinDeth

...I have no idea if this Baer brake setup uses a big or little piston and how I should calculate this all out. I'm stabbing in the dark here.

The Baer brake kit you have uses 1993-1997 LT1 F-body rear calipers if I'm not mistaken (the same as the 88-96 C4 Corvette calipers except for the direction of pull for the parking brake cables). These calipers have 45mm [1.77"] diameter pistons which are relatively small compared to your fronts. Balance is going to be a little tough to achieve with a single master cylinder, but I'd probably be more inclined to run a smaller bore (1" or 1-1/16") MC with the adjustable proportioning valve on the rear.

Spongy but no air eh?...that's a neat trick. Could be a bad MC, however that still won't typically feel spongy but rather a sinking feeling cause by fluid bypassing the seals. They'll still usually pump-up, if not just temporarily, at least until they get really bad. Fill us in on how you know you don't have any air in the system with special attention given to how you bench bleed your master cylinder before installing it.

Tobin
KORE3