I just bought a used 1968 Camaro that has a 4-wheel dics brake conversion installed. The problem is the calipers don't seem to be releasing. The brake pedal is at the top, but has almost no travel. (I can't push it dowm, it's stiff) What could cause this problem? Is there something I can check? All the parts seem to be relatively new (master cylinder, rotors, calipers, spindels etc)

Do you have vacuum at the brake poster?And have the brake hoses been replaced?Realy sounds like a bad brake booster.

who did the convert may have moved the piston rod in the master clynder. this would cause presure at the wheels. also bad ruber lines would do this at one wheel only