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Registered User
Join Date: Oct 2012
Posts: 31
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Stopping is important... Right?
After sitting for several years, my car had a very soft pedal that needed to be pumped up to get any sort of braking power...
First thing I did was perform a heavy flush of the brake system using a pressure bleeder. This had no effect. Second, I installed a brand new master cylinder, and performed a re-bleed of the system. Again, same behavior as before. No brake performance until I pump them up. Lastly, thinking my ABS pump was going out, I ordered some brake lines and a Tee for $75 bucks that allowed me to bypass the ABS strictly for diagnostic purposes to see if the pedal firmed up. I wanted to be sure that the pump was faulty before dropping a grand... Unfortunately, after installation my pedal is still soft. I have triple checked to confirm that there are no leaks in the system... And the reservoir level is constant, which seems to prove this. I have bled just the master cylinder, I have reverse bled the system, I have pressure bled the system, and I've bled the old fashioned pedal-pump way. Each time in the correct order. (RR, RL,FR,FL) Guys, I'm at a total loss of where to go next. Any ideas? What could I be missing? |
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10-27-2012, 07:35 PM
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Registered
Join Date: Dec 2003
Location: Atlanta, GA
Posts: 30
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Ugh how frustrating, eh? Take a look behind your pedal cluster for leaks. Seams you may have a bad seal between the pedal and Master Cylinder.
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10 years PCA member 1990 964 C2 (Completely restored and tastefully modified) |
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10-28-2012, 04:22 AM
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Science is NOT optional
Join Date: Aug 2008
Location: West and further west
Posts: 1,978
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Delete
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PCA member since 1993 Last edited by rbogh901; 10-31-2012 at 07:05 PM.. |
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10-31-2012, 11:41 AM
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Registered
Join Date: May 2003
Location: Detroit (Rock City!)
Posts: 783
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What car? Did you bleed the accumulator (if fitted)?
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'90C4 |
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10-31-2012, 02:40 PM
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I once had problems with mushiness after a brake flush and pad replacement. One of the members on this board years ago told me to make sure the brake pads are squeezed into place. I had pushed the pistons back into the calipers and just depended on pushing on the brake pedal to tighten everything up. I'd tried everything so I went back and followed his advice. He was right, the mushiness went away.
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1979 Porsche 911SC Targa 1996 Porsche 993 C4S 2005 Porsche 996 Turbo S 2020 BMW X3M Competition 2003 BMW M5 |
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10-31-2012, 03:02 PM
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Registered User
Join Date: Sep 2010
Posts: 8
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Using female-female connectors and bleed nipples you can work your way from mc to calipers isolating parts of the system to locate the issue, sounds like theres air still in the system to me.
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11-01-2012, 01:34 AM
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2020 BMW X3M competition
1979 Porsche 911SC
1996 Porsche 993 C4S
2003 BMW e39 M5
2005 Porsche 911 Turbo S
