brakes

[mattsil80wis]

Well i just got my car running again, but the brakes are acting very weird. When the car is running and you hit the brakes, the pedal goes right to the floor. Than when you continue to pump the brakes, the pressure builds back up. I just replaced the master cylinder with a brand new one. I have also gravity bled the brakes along with power bleeding them. I have done manually bleeding them too. I have bleed each brake about 75 times and in the proper order (furthest first working your way closer).

Myself, my buddy, and his entire shop are at a loss for what is wrong with this. We have tried just about every idea we can think of with no such luck.

If anyone has any ideas i would greatly appreciate it

thanks

[s13 @ fullboost]

did you check all the brake lines for leaks?

[projectRDM]

Check valve is bad on the vacuum line more than likely. Otherwise it's the booster itself.

[mattsil80wis]

no leaks in any of the lines

anyway to check the check valve? or know if the booster is bad?

wouldnt a bad booster create a rock hard pedal?