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I have a 07 4x4 Dodge Ram 1500 and the front Passenger caliper keeps locking u[ when reaching a speed of 50mpr . What would cause this? Truck has all new brake's on front.
Also sounds like the pad slides are grooved which causes the pad arms to stick in the groves, that could cause the issue (especially if they have cracks in the new pads in the center).
On the knuckle, if the shop didn't grind the slides where the brake pad arms slide and lubricate them they can get stuck in the groves/pits from the old pads. Also could be a bad wheel cylinder, or even bad rubber brake line going to the wheel.
However you are posting in the wrong section, we do not know your truck, but these are some well known facts.