4 runner brake MC (1 Viewer)

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Enumclaw, WA
There are two wires coming off the rear of the booster. I think it is like green with yellow and white with black. Does anyone know what they are used for? Brake sensor perhaps?

As I recall, is there not a sensor on the brake pedal itself?
 
at the base of the arm of the brake pedal itself, there's a little switch that goes *click* when you depress the pedal, and turns on the tail lamps. (or at least in my '73)
I don't know about the booster.
 
Rear of the master cylinder? Low fluid sensor. Measure the resistance across the two wires with and without fluid. It could be connected to the brake warning light depending on your setup.

If you've got wires coming from your booster, post up a picture.
 

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