Now that's really bizarre! I've heard this failure mode before
on older Spridget brake systems using a pressure switch
to turn on the brake lights (rather than an electrical switch
on the peddle mount) but never saw or knew what type of
pressure switch it was. THAT switch you pictured,
is used as the oil pressure and anti run-on switch on nearly
every Jag and late model Triumph.
8 Triumph to date (I've owned) and I've never had one go
bad or leak or even fail electrically for that fact.
I've never seen one go bad. But then again, in an oil pressure
application, the switch never sees more than 90 psi. I'd assume
in a brake system application it may see a whole lot more.
I truly don't think that switch was designed for that type of pressure
to begin with
----- Original Message -----
From: "Scott H." <email@example.com>
Cc: <BritishCars@autox.team.net>; <MGs@autox.team.net>;
Sent: Tuesday, November 26, 2002 6:38 PM
Subject: Potential Brake Failure Warning
> Hello everyone,
> This is a warning to anyone who may possibly have the same type of
> brake light switch on their car as I "had" on mine. I don't recall right
> hand which of the vendors I purchased this switch from, nor does the
> have a manufacturer's name on it, but I will eventually figure out who the
> unique mold symbol belongs to. I am only interested in warning them of
> potential safety problem. It could save a life.
> I am in the process of restoring an Austin Healey. I have purchased a lot
> very good quality new components for this car, but unfortunately one of
> appears to be defective. The other day while bleeding my brake system, I
> pressing on the brake pedal while my son was at the bleed screw to allow
> air to be forced out of the new brake lines. During the process of
> the brake pedal, I was able to build up fluid pressure, but then all of a
> sudden the pedal went to the floor and I immediately heard fluid pouring
> my garage floor. After tracing the origins of the leak, I found brake
> dribbling from the brand new brake light switch that I had installed.
> the body of the unit, not the threaded portion. Fortunately my car is
> in the garage on jack stands, but if I were braking for, God knows who or
> what, I might not be sitting here typing this letter.
> Anyway, you can view the switch on the web site I have constructed for
> purpose (see below). Please take a look at the images and make sure you
> have the same switch on your car. If so, the rest is up to you. Since
> switches are used for many different models, please feel free to FWD this
> message to anyone else who may benefit. Meanwhile, if anyone knows of a
> well-known quality brake switch that I could buy, please let me know.
> Scott Helms
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