Dsmith

Curently I am having brake trouble. New caplipers, all around. Bled the system, after 50-100 miles of driving the pedal gets closer to the floor and under hard braking the light comes on. Pumping brakes gets it to go aff at least. Deal is, barring there are no leaks, I did let the rear master cylinder cavity get too low, dry as they say. I just added fluid to it and bled the system again. Now I certainly do have trouble. Should the cylinder be flushed? How is that done? While still attached to the booster? :confused: :mad

Chris@VetteFinders

You positive there are no leaks? Checked the rubber lines to metal line connection? Checked the junction block in the rear, where the lines connect to the calipers? Checked the propotioning valve? Bleed all FOUR bleed screws on the rear calipers?

If yes, then I'd say replace your MC, or at least bleed it.

Duke94

Bleed the master cylinder first otherwise you'll just pump the air to the calipers.

SharkAttack

I would check for leaks first, and if none are found, bleed the MC and follow with bleeding each individual wheel caliper (one at a time). Also, have the person sitting in the driver seat hold constant pressure (not "pump" the pedal).