We have a 94 grand am. The whole brakes system has been replaced from brakes, rotors, calipers and hub bearings. The brakes lock and we have no clue as to why and we are supposed to have an anti-lock system. What could be causing this to happen.|||Have a mechanic check the brake sensors and abs computer.|||master cylinder|||If its locking the rear wheels when you stop the first time thats a normal problem on these cars. after a couple stops they shouldn't.If its each stop then your rear brakes should be checked.|||are the brakes locking up when you apply them or just driving down the road? if they are locking up when going down the road, you can try to replace the rubber brake line from the caliper to the metal brake line. it starts to get corroded on the inside and doesn't allow fluid to flow back into the master cylinder, causing the piston in the caliper to stay out keeping the pads pushed onto the rotor. If they are locking up when you apply them it could be 1 of 2 things. it could be a proportioning valve which controls the amount of force applied to the front and rear brakes, or you could have contamination in the brake fluid, check to see if it clear or has a milky color, if it has a milky color it as been contaminated.
hope this can help
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