I have a 78 f250 and this has been the brake job from hell. I have replaced everything from front to rear and still I HAVE NO REAR BRAKES CAN ANYONE HELP? I think I might have gotten a bad proportioning valve. Does anyone know what the pressure should be for front and rear? PLEASE SOMEONE HAS TO KNOW!
Rear brakes not moving at all? A porportioning valve coudl screw it up but I highly doubt it, remove them and see if you can get pressure, usually a proportioning valve that has failed will over supply the pressure.