66 slammed hearse

[kdrodworks316]

Originally Posted by markeb01

If you have disc/drum brakes on the truck, and accidentally have the disc/disc combination valve installed, spongy brakes would likely result. Without the 10 psi valve the return springs will overcome system pressure and increase initial clearance in the drum brakes.

I thought that might be the problem. I will try the other valve and give an update.....