cannot get brakes after bleeding 3 times, would this have anything to do with proportioning valve on rear of truck
customer had a brake pipe rot off and was repaired. I have tried for 3 days to get brakes. They are fine for a bit then loose pedal. One bleeder screw i cannot get loose, afraid of twisting it off. I have replaced master cylinder as well. The pads are fine. email maxp@nb.sympatico.ca bp thank you !!