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Hey Guys

The little switch on the side of the master cylinder, with the one-wire connection, is this for the fluid level?

Rgds
Theo
 

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On a 90 it is for the proportioning valve located in the master cylinder. Fluid loss in the front or rear brakes will cause the valve to move grounding the switch & illuminate a dash warning light.
 

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On a 90 it is for the proportioning valve located in the master cylinder. Fluid loss in the front or rear brakes will cause the valve to move grounding the switch & illuminate a dash warning light.
I agree , as it is that way for almost all cars

I believe the res. sensor wire is separate
 
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