brakes - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

mattsil80wis · 07-15-2009, 02:42 PM

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* · 07-15-2009, 02:51 PM

did you check all the brake lines for leaks?

projectRDM · 07-15-2009, 03:16 PM

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

mattsil80wis · 07-15-2009, 08:32 PM

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?

07-15-2009, 02:42 PM	#1
mattsil80wis Zilvia Junkie Join Date: Jan 2008 Location: nj Age: 34 Posts: 391 Trader Rating: (6) Feedback Score: 6 reviews	brakes 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

07-15-2009, 02:51 PM	#2
s13 @ fullboost Spirit Of Ecstasy Join Date: Dec 2007 Location: Simi Valley, CA Posts: 2,531 Trader Rating: (15) Feedback Score: 15 reviews	did you check all the brake lines for leaks? __________________

07-15-2009, 03:16 PM	#3
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 47 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	Check valve is bad on the vacuum line more than likely. Otherwise it's the booster itself. __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

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07-15-2009, 08:32 PM	#4
mattsil80wis Zilvia Junkie Join Date: Jan 2008 Location: nj Age: 34 Posts: 391 Trader Rating: (6) Feedback Score: 6 reviews	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?