Here is something to ponder that I have seen before
on alpines.
The master cylinder requires that the reservior feed hole be
uncovered by the piston when the brake is not pressed.
If it is not fully un-covered, the pressure doesnt relieve
itself in the high pressure circuits (IE brake lines).
This anomily is an exact fit to explain your woes.
Ive heard of catastrophic brake seisure becuase of such
a condition.
Ive seen cases where the wrong MC, or too long of MC
actuator rod, or the MC spacer has been removed without
consideration for the detail that I have just mentioned.
Jarrid Gross
-----Original Message-----
From: owner-alpines@autox.team.net
[mailto:owner-alpines@autox.team.net]On Behalf Of Ian Spencer
Sent: Sunday, November 11, 2001 1:32 PM
To: Al Adams
Cc: alpines@autox.team.net
Subject: Re: Brakes binding and overheating.
Sounds like you still have air in the line. It can be very tough to get all
the air out after a complete rebuild when all the lines have been drained.
Al Adams wrote:
> Many thanks to everyone who responded to my brake problem.
>
> Jan's suggestion that the replacement MC may not match the original
> seems to be answer. I removed the new MC and took it apart to inspect
> the "innards" and compare them to the original MC that I had replaced.
> There were a few of the same parts, but most of them were different.
> The outside measurements of the unit itself were not the same, either.
>
> I reinstalled the original MC and took it for a test drive. After
> several miles of travel and with lots of extra brake use, there was no
> binding or overheating. Everything was comparatively cool when I
> arrived home. Although I've rebuilt the original MC and the bore looked
> good at rebuild, I still have to pump the brakes to get them to hold.
> I guess I'll need to have it resleeved and try to use it. At $120 each,
> I can't afford to keep buying new MCs until I find one that works.
>
> >From some of the responses I received, it looks like the car should be
> fitted with a brake servo, but it isn't. Should I try to locate one?
> Are they really needed? Could the absence of the servo have anything to
> do with the problem of having to pump the brakes with the original,
> rebuilt MC? Suggestions on vendors for resleeving the MC?
>
> It looks like the solution created more questions. Thanks again to
> everyone.
>
> Al Adams
> Brandon, MS
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