we have replaced brake booster, master cylinder and all brakes.it also has been bled.
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2005 Chevrolet Colorado Question: front brakes are locking up after a few miles. what could it be?
Answer #1Autohaus Lake Norman from Autohaus Lake Norman, May 06, 2012, 15:37Journeyman
Really hard to say without looking at the vehicle in person, but one thing that usually causes that is contaminated brake fluid. If somebody put anything other than DOT 3 or DOT 4 brake fluid in your master cylinder, the fluid can become contaminated and cause the rubber seals to swell up.