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Message: <blockquote data-quote="19road_runner68" data-source="post: 24155" data-attributes="member: 1683"><p>I'm not a CAT. mechanic, but I do turn wrenches in the automotive field. After working on car electronics for over 10 years now, I wouldn't doubt thier findings. I'm loooking at the cat. service manual for a 257 and the brake control switch does run through the E.C.M. If it was me, I would check the wires from the switch to the ECM for an area of wiring that may have rubbed through, and now the wires are touching the frame of the tractor. This is called a short to ground. If that's not the problem, I would jump the switch with a fused jumper wire and look for results. If that doesn't work, I would run power to the park brake solenoid to make it work, eliminating the computer all together. that doesn't fix anything but it should get you working again.</p></blockquote><p></p>