Scott:
The picture on your web site is of an oil pressure switch, not a brake light
switch.
The switch pictured appears to be the three prong type normally used on
later TR6 and TR7 for control of the anti-run on valve. GPS113
The correct brake light switch should have only two contacts. So far as I'm
aware the brake light switches normally supplied by Intermotor, etc have
proved to be very dependable. (thankfully)
I think this may explain your problem, as the hydraulic brake system creates
far higher pressure than the oil pressure switch would be designed to
handle.
regards
Kelvin Dodd
> -----Original Message-----
> From: Scott H. [mailto:austrheamgafun@arczip.com]
> Sent: Tuesday, November 26, 2002 3:39 PM
> To: Healeys@autox.team.net
> Cc: BritishCars@autox.team.net; MGs@autox.team.net;
> Triumphs@autox.team.net
> Subject: Potential Brake Failure Warning
>
>
> Hello everyone,
>
> This is a warning to anyone who may possibly have the same
> type of hydraulic
> brake light switch on their car as I "had" on mine. I don't
> recall right off
> hand which of the vendors I purchased this switch from, nor
> does the sensor
> 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 the
> potential safety problem. It could save a life.
>
> I am in the process of restoring an Austin Healey. I have
> purchased a lot of
> very good quality new components for this car, but
> unfortunately one of them
> appears to be defective. The other day while bleeding my
> brake system, I was
> pressing on the brake pedal while my son was at the bleed
> screw to allow the
> air to be forced out of the new brake lines. During the
> process of pumping
> 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 onto
> my garage floor. After tracing the origins of the leak, I
> found brake fluid
> dribbling from the brand new brake light switch that I had
> installed. From
> the body of the unit, not the threaded portion. Fortunately
> my car is sitting
> 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 this
> purpose (see below). Please take a look at the images and
> make sure you don't
> have the same switch on your car. If so, the rest is up to
> you. Since these
> 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.
>
> Thanks,
>
> Scott Helms
> http://users.arczip.com/zntech/switch.html
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