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I’ve been trying to figure this problem out for years, though there is no mechanical problem with my brakes so I don’t lose sleep over it. The parking brake indicator stays on and the display reads “service brake system” I’ve already tried cleaning the grounds, there are no ABS codes stored, in fact, there are no codes at all in my truck and the ABS works properly. I tried swapping out the ABS module thinking there could be an open in the circuit board, in hindsight that probably would have registered an ABS code. The only brake system issue I have is that the park brake cables/shoes need to be adjusted. meaning the parking brake doesn’t really work that well and you have to push the pedal all the way to the floor to get anything. Could this be a brake system mileage maint request? Park brake switch? Trailer brake circuit?
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