Quote:
Originally Posted by wdb
If the pedal sinks there is a leak somewhere. It could even be the master cylinder, leaking past the seals and back into the reservoir. I'm with Vanne -- the pedal should stop going down at some point. Otherwise something is broken.
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Remember, with car off, pedal stays solid. It's when it is idling, I'll pump and get a firm pedal, but then within 5 seconds it slowly drops.
I have a new master cylinder going in and will report back. I suspect that could be the issue. I did replace the ABS pump and all the lines who no signs of leaking. I don't think this is related to my knockback issue but it's about the only thing left in the braking system I haven't replaced.