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weird brake problem.

darkshadow

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ran new brake lines a few weeks ago, SS front pass and Pvalve to rear. also new MC.

yeserday on my way to work after an hour of driving, i had almost no brakes.

limpped it home, and am trying to figgure out what the hell is wrong.


I flushed the whole system to rule out air with a pump up sprayer i made.

checked the master for seal leaks, its dry, checked shoes, nearly perfect adjustment, front calipers are a year or two old and work fine.


if i am sitting the pedel is stiff, but once i drive for a miniute it is soft, like maybe the last 20% of the stroke gives me any brakes, but if i pull it back with my foot and pump it 3 or 4 times it gains psi, and gives me good brakes.

WTF, i can figgure it out.


p valve?
 
master cylinder, what kind is on it? at the least go with napa or step up to GM... but NO otterzone... get any air from the proportioning valve?
 
i dident blead from the p valve, but i flushed probaply near a quart so there cant be any left in there.

this came on sudenly after two weeks of good brakes.

i don't know the brand of cly, was new not rebuild, got if from a local parts store.
 

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