Brakes apply themselves.
2012 ford f350 dually 6.7 Dsl. The has run flawlessly for 1200 miles. Last week cruising
down the highway. The tuck started to loose speed. I accelerated to compensate but Ge
brakes forced me to pull off the road. All four calipers stoking hot. After sitting a hour
waiting for a tow truck the brakes went back to normal. Drove it to the dealer for
diagnoses and repair. They couldn't find a problem. Picked up the truck and drove 3
miles and problem reoccurred. Help!
Make the dealer look again, and/or make the mechanic drive it until it happens. Or try another dealer. Your brakes are dragging. There is a 'reed valve' or 'flapper valve" that keeps the calipers from sticking, and when it happens on all four as you describe the problem is likely in the master cylinder
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