Quote:
Originally Posted by rpete
Hey all I️ have a question that has baffled my local Toyota dealership and what seems like a major issue to me. For about the past year when applying the brakes for a prolonged period of time I️ consistently loose pressure until the pedal bottoms out, usually takes about 2-3 minutes, however if I️ ever release the brakes and reapply it always has full pressure again. They said they are at the point of needing to just start replacing things trial and error style. I’m mainly worried it will get worse or just go poof someday. No visual leaks, is always consistent and always happening, and there is always more pressure if I️ release and reapply. Any suggestions or anyone had this issue before?
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You need to find another dealership.
What you are describing is typical of leaking internal seals in the master cylinder. Because the seals are leaking internally, you will not see any external fluid leaks. Unlike years ago, where one could rebuild a master cylinder, I believe the only fix for this now is to replace the master cylinder. I haven't had to do this on either of my '03's, so far, so I can't give you any specific cost information, but as I understand it from other threads I have read, the replacement costs are quite expensive.
Do a search on this site for master cylinder replacement, and you should find more information.