I think what would concern me is that fluid
has reached that switch to begin with!
The plunger inside, shaped like a barbell,
has seals around it on either side of the depression
where the switch tip rests. If and when you have a failure
in one of the ckts, the plunger moves sideways depressing
the switch. It sounds like these seal might be a problem.
Pull the switch body out of the brass main body and
look down i nthe hole. You should see two angled
walls down inside on either side of the hole where the
switch came out. If it looks 'filled' the plunger inside
is already off center, denoting a passed failure, or it
might have been forced off center during a brake bleed job.
Brake fluid should never be able to get to the switch
due to the seals on the plunger/shuttle inside the unit.
Paul Tegler
ptegler@cablespeed.com
www.teglerizer.com
----- Original Message -----
From "Tim Holt" <holtt at nacse.org>
To: <spridgets@autox.team.net>
Sent: Tuesday, February 25, 2003 2:38 PM
Subject: Brake Pressure Fail Switch (leaking now, need to replace)
> I noticed a while back that I'm getting a slight leak of brake fluid
> leaking from my pressure fail switch (that white plastic/nylon thing
> that threads into the cast brass pressure warning asembly).
> Specifically it looks like it's leaking IN the plug - where the male
> plug ends are. Guessing it got bumped once by someone working on the car.
>
> So that said, I wanted to replace it. I ordered a new one from Victoria
> British (part # 7-434), and just got it. Wrong part. This one has a
> nylon part where the sensor wires plug in, but also a brass/metal part
> that should thread in. Not at all like what the original looks at.
> Based on catalog info, it should have been the right one (given I've got
> a 1275 ('74 midget).
>
> So...
>
> 1) Going by the catalog, I got the wrong part. Anyone know what would
> be the RIGHT part?
> 2) Anyone know of a source for this part other than VB? Moss didn't
> seem to have it in their catalog.
> 3) How much danger of a catastrophic failure do I have right now with
> the leaking part? I had wondered if some day I'll put on the brakes and
> have it blow out.
> 4) Until I get the right part, would it be reasonable to just thread in
> a bolt of the same thread to stop the leak? No pressure failure warning
> then of course.
>
> Thanks.
>
> Tim Holt
> '74 MG Midget
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