Re: Booster and Master Cylinder

Posted by HH56 On 2009/3/2 9:28:11

That's plausible although I don't think it has to be parked any special way--believe the fluid is always higher. There is only the single rubber lip around piston shaft that is the liquid seal. If any kind of pitting occurs anywhere the lip normally sits, it's over. Several parts cars we had were in that condition after sitting for years, and if those TV's were returned to service without a go thru, there would have been an issue.

I don't believe any leaking fluid would account for the issues of intermittent no pedal though--believe that is strictly compensator valve. It would, in my opinion, be hard for the residual valve to fail in any way that would lose brakes unless somehow it totally blocked the outlet. In that case, would think the pedal could hardly move at all--even if the vacuum were sucking fluid it would be a fairly slow move to floor.