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My traction control light would not shut off. Tried the zero point calibration did not work. Pulled off each tire in case something stood out. Gave up.. Truck under warranty took it to the dealership first they replaced the brake actuator assembly. 2500 bucks.. didnt work. So then they pulled off the master cylinder and found leakage into the brake booster that set off the sensor. Total cost 4k. Dealer note:
Traction light on found code B1267 due to internal open circuit inside brake control module. Found brake fluid leaking into brake booster replaced brake control module assembly brake booster and master cylinder
 

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Initial thoughts: I wonder if the amount of brake fluid lost would be enough to be noticeable by checking the markings on the reservoir, or if there was enough fluid in the brake booster to form droplets on its bottom.
 
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