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Light was dim (not fully lit). Removed connection to proportioning valve brake pressure sensor. Cleaned out water and transmission fluid from the sensor. As mentioned, I had a leak from Callilac valve hose, and used water to clean up the mess. Sensor was saturated with oil and water...

I am working through the diagnostics via the TMs and the wiring diagram on a brake warning light (on after parking brake released). I could use some help understanding the function of the pressure sensor on the proportioning valve. Precursor, I had a Cadillac valve hose leak...