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Q:

front brakes are locking up after a few miles. what could it be? on 2005 Chevrolet Colorado

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
we have replaced brake booster, master cylinder and all brakes.it also has been bled.
(1) Answer
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.