I have a 2007 GMC Sierra 2500 HD my brakes were locking up to get a mechanic they told me it was the power booster change the power booster still continue doing the same thing tell me there were the calipers I changed all four of them brake pads and the rotors still continue that tell me what's the power steering change the power steering change the master cylinder change the ab ABS pump the ABS module fuses everything the left hub with the sensor the right side sensor abs I've done almost everything new to that truck and still the brakes are locking up help me please help me
