Okay, this truck is the old body style like the 06. It came in with a leaking master cylinder. Along with the leak customer complained about a roaring right before it stopped. We changed the master cylinder and bleed the system with the computer and manual bleeding procedure. Got good pedal. So went for a test drive. about a mile into the test drive I noticed that sure enough when you slowed down right before the vehicle came to a complete stop it would activate the ABS. So, I speed up and just let it coast to a stop and I notice the brakes were starting to lock up. I turned around and headed home. When we got here both calipers on the front were smoking hot. Vehicle has no codes. The only abnormal thing on the computer was when the ABS activated right before stopping each time the right front dump valve was activating. Anyone have any issues like this on these trucks before?