2001 GMC Sierra • V8 4WD Automatic •
I have a 2001 GMC sierra sle z71 4x4 extended cab 5.3 automatic and all 4 of the brakes are locking up when driving and continue to become increasingly difficult to go until they lock up to the point you can not move the vehicle at all when left to sit for a while 1 to 4 hours the brakes systems becomes operable again then when driven 5 to ten miles locks up again no abs or brake lights come on the dash and no faulty readings when plugged into a diagnostic unit I changed the abs unitcontrol module (the entire unit module and block) to no avail then I bled the right front caliper which released the pressure on the brake system and disconnected the 2 electrical plugs on the abs unit itself and the 2 sensors on the frame rails going to the front hubs in the engine compartment and pulled the main 60 amp fuse out the ABS light came on the dash cluster then drove the truck off and on over the course of 60 miles with no problems then all 4 wheels locked up again I cracked open the master clyinder lines till fluid dribbled out and retightened. No help still locked then cracked open the bleeder on the driver side caliper fluid squirted out and retightened no help then I cracked open the bleeder on the passenger side front caliper fluid squirted out I retightened and that released the pressure on the brake system I drove it for several miles and the brakes slowly locked up again what the hell is going on I do not have much sanity left or how do you disable it altogether
January 9, 2011.
January 9, 2011.
I don't feel the ABS is the problem. Check all rubber hoses going to the brake system. Try this. When they lock up, see if you can release the brake by breaking a bleeder open on the caliper. If you can, that tells me the rubber hose is bad. They break down inside and allow pressure to be forced into the caliper, but there isn't enough return pressure to release it. As a result, the caliper sticks.
Jan 14, 2011.
Jan 14, 2011.
I have the brake warning light ON on the dash, and the ABS light does not work at all, even when I switch to ignite. I also have noticed that the ABS is not working in hard braking.
12 answers • 1999 Jeep Grand Cherokee • 161,000 miles
I have a 1999 jimmy 4.3L 4x4. I had all the brakes and rotors replaced 4 months ago and now the ABS light comes on and activates at low speeds. Father in law driving it and went to park...
2 answers • 1999 GMC Jimmy • 110,000 miles
1994 Honda Civic EX w/ABS.After replacing brake pads, MC (bench bled) and Booster, brake pedal has good steady pressure until the engine is started, then pedal goes to the floor.Brakes ...
4 answers • 1994 Honda Civic • 250,000 miles
My 1997 Olds Cutlass Suprme with 4 wheel disc brake has the ABS light glowing. It makes a clicking noise when the brake is applied when the ABS light is out. Then the light glows and ...
2 answers • 1997 Oldsmobile Cutlass • 146,800 miles