Re: HELP: 93 Toyota Corolla vibration problem! PROBLEM SOLVED!

krp wrote:
> 
> <jonb55198@[EMAIL PROTECTED]
> wrote in message
>
news:8b46192c-bb4a-4bda-8fd0-4a13d73236cb@[EMAIL PROTECTED]
> > On Apr 8, 12:21 pm, jonb55...@[EMAIL PROTECTED]
 wrote:
> >> I have a 1993ToyotaCorollawith 265k miles on it.  There is a
> >> vibration that has the following symptoms...
> > <snip>
> 
> > The solution to the problem was that one of the cups in the master
> > cylinder was disintegrating.  This debris made its way down the line
> > and clogged the pro****tioning valve.  Thus, when the brake pedal was
> > released, fluid could not flow unimpeded back to the master cylinder
> > and brake pressure built up.  Replacing both the master cylinder and
> > the pro****tioning valve fixed the problem.  Thank you to all who
> > contributed to helping me diagnose this problem.
> 
> When the master cylinder was suggested there was great howling from some
> corners.

Seems a bit doubtful there was anything at all wrong with the master
cylinder. If there was that big of chunk of rubber missing from in the MC
that would have produced a noticeable symptom (sinking brake pedal). They
eventually found the problem after the master cylinder was replaced - that
doesn't mean the MC was the cause or even a contributing factor. More
likely whatever the "debris" was causing the blockage came from somewhere
else. Since the problem started after doing the first brake job the debris
probably came from the direction of the wheels when the fluid was forced
back by retracting the wheel pistons. 

-jim


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