Duramax Chevy brakes keep locking up

[@cjtyler01]

Were both your brakes locked up? Because my front drivers caliper is locked up and I replaced the caliper, rotor, and pads and I bled them and it won't release pressure unless I crack the bleeder. Edit: To clarify, the other 3 calipers work no problem. It's just the front driver's side.

[@MDSSQUARED]

Master cylinder is likely your fix it cause any callipers to lock up anytime randomly