Adjustment good on the drums? ABS or not? Pull up on the handbrake, does the pedal improve? If yes the rear brakes are out of adjustment, or the wheel cylinders are leaking(sucking air). If you have brake hose pliers, clAMP OFF ALL FOUR WHEEL BRAKE HOSES, THEN TEST THE PEDAL HEIGHT, IF IT'S very GOOD(NO MOVEMENT) THE MASTER AND LINES ARE AIR FREE, IF NOT KEEP BLEEDING, Now remove the clamps one at a time, while the pedal is held down, when it drops significantly, you have your bad hydraulic unit located. Seals under the caliper dust boots and under the rubber boots on the wheel cyinders need to be checked for fluid dripping.
When you bench bled the master, did you use the finger, hose or brass plug method? I use the brass plugs and gently push the plunger half way in and repeat until the piston no longer moves, this removes all doubt about air trapped in the master.
Monday, October 18th, 2010 AT 10:40 PM