Quote:
Originally Posted by Prong
Master cylinder is on the way out most likely. I've had 2 go bad over the years and this is what they'll do most of the time.
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Yes, Master Cylinder's can and will cause creeping pedal, and also can aerate the fluid if there bad enough.
Sounds like this is what you have , you bleed it , its OK for a while then the low pedal starts , making the light come on.
Make 100% sure there are NO hidden leaks , I have seen pin holes in rusty old brake lines that only leaked under extreme brake pressures. Even a seeping wheel cylinder can give you a crappy pedal.
Not an electrical problem , but a Hydraulic problem.
Desert