I may be totaly off the wall but I am assuming that you are not able to keep a firm pedal when you first hit the brakes. If that is the problem go to www.tsmmfg.com and order a 2lb residule valve. That will keep the calipers tighter to the rotor to eliminate that problem. What calipers are you using?
Chump, I installed another rear axle I had that has disc brakes.
Gmule, that is exactly the problem, thanks! Brakes work well, the pedal is just too spongy.
I had this problem before with this particular axle setup w/ a mastercylinder setup for discs/drums, I gutted the proportioning valve to get the rears to work at all, but always had a spongy pedal. Now I'd like to just have a firmer pedal. This time around I just bypassed the prop. valve altogether, easy enough w/ all the extra line coiled up.
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