I have a 1986 pontiac 6000. The master cylinder has four ports (2 with proportioning valves). I changed the m/cyl and tryed to bleed the brakes. Only one front and one rear would bleed. The other 2 would not let the pedal depress down thus reducing stoping. The pedal is hard to depress and the vacuum booster is good. Help.
Thursday, September 20th, 2012 AT 12:23 AM