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ABS and Brake Light on, until....

Me78569
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Me78569

Me78569

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I have been dealing with brake and ABS lights on all the time from key on to key off.  I have also been suffering from "irregular" / "unpredictible" pedal feel.  Sometimes pedal feels fine other times it goes to the floor.  Braking power is still there however.  

 

So I got a hair up my butt today and started probing wires.   Tested the rear ABS sensor, 1.8 k resistance, which is within spec for the sensor. 

 

While I was under there I unplugged the Sensor on the proportioning valve and BAM no more lights. 

 

 

So what does that sensor do?  and why does the ABS computer throw a hissy fit when it is plugged in?  I am assuming it is telling me that pressure is off in either the front or rear?

 

 

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