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brake gimpiness part II, 3 more bleeds, minimal results 200 1986

posted by  scorch on  Sun Feb 1 08:55 CST 2004
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When I pump the pedal till it's firm, it will still sink back down to the floor eventually. Even with the car off and power assist off, The pedal will go about 3 inches after pumping it a bunch, before it gets really hard. You're thinking the MC is bad? What could I have done to ruin a new MC?

Given your description it's possible you've got a bad MC, but I wouldn't assume it was your fault. And it still would be worthwhile to go through the whole process again - bench bleed, then bleed all 4 wheels, etc. - before you exhange the MC for another one. Depending on what you mean by "eventually," I guess it's still possible that there's some air somewhere. But it's unlikely. When you pump the system, it compresses the air to the point where the pedal is firm, and unless you take your foot off the pedal, the air should stay compressed. So if all the air is compressed in the system to the point of firmness and the pedal still sinks, the most common explanation is that fluid is getting past the seal in the MC.

I've had bad MCs from Kragen and Autozone in the past.






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