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Re: digest #1107 Tue Apr 7 02:05:00 MDT 1998

To: mgs@Autox.Team.Net,
Subject: Re: digest #1107 Tue Apr 7 02:05:00 MDT 1998
From: "Editors, Molecular Vision" <>
Date: Tue, 7 Apr 1998 07:14:15 -0500
Tyson wrote:

>The new cylinder leaks out of the "dust covers" as they're called in the
>factory manual...the two seals that go on the outside of the pistons.


If you bled the brakes by pumping, and pushed the pedal all the way to the
floor while doing so, then you pushed the piston past where it's supposed
to go. I don't know what year your car is, but for mine ('65), this allows
fluid to spurt into the cylinder at the front (relative to front of car) of
the cylinder. There is an extra hole in the cylinder that allows this, so
it is a feature, not a bug:). I don't understand the design, but there it
is. This fluid then leaks out of the dust covers. No big deal, just don't
push the pedal so far next time (MI suggests putting a chunk of wood behind
the pedal against the firewall to prevent the pedal from going too far.)

If the cylinder is newly rebuilt and was either sleeved or honed, you are
ok. If not, the rubber cone/plunger probably got scratched while passing
through this part of the cylinder because this region, not usually in
contact with fluid,  corrodes over time. The corrosion can dig into the
rubber, which will speed its failure, resulting in real leaks. Can be
annoying and eventually a big deal.

Good luck,


Jeffrey H. Boatright, PhD
Senior Editor, Molecular Vision

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