OK..WTF..front brakes constantly on
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OK..WTF..front brakes constantly on
what would cause the front brakes to be constantly on??It seems the calipers are sticking somewhat causing the pads to be in constant contact rotor
Le Mans Master
Joined: Feb 2002
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From: Waldorf MD
You could take out pads and make sure they are lubricated to slide in the "little aluminum pans". Also the bolts need lubricated where they slide.You know that the pads do contact the rotors. Rotors also get very hot in normal driving. What makes you think your's are bad? Do they smell? Do you have brake fade?
Last edited by Oldvetter; Dec 10, 2007 at 09:46 AM.
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Bad Smell &
Break pedal is all the way to the top and will not move.
so the result was a 1 hour wait on the side of the road & a tow.
Yes the truck was the exact same color
Melting Slicks
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From: cincinnati ohio
I dont know what year your car is , but GM had some issues with the power disc brake boosters causing exactly what your problems are. This was a bulletin during the 2001 model year, but that does not mean that was the only year. Hope this helps.......Happy Holidays !!!!
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I dont know what year your car is , but GM had some issues with the power disc brake boosters causing exactly what your problems are. This was a bulletin during the 2001 model year, but that does not mean that was the only year. Hope this helps.......Happy Holidays !!!!
It is an early 02 built in 01
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There are a few things that will cause brakes to drag:
1- bad caliper (pistons will not retract)
2- Caliper slider pins seized (wont allow caliper to move side to side)
3- Bad BPMV (will not allow front brake pressure circuit to vent back to the master cylinder.
4. Bad master cylinder.
5. Never seen a bad booster but I would check the bulletin to see what it says.
Problems 1, 2, & 3 are easy to check and repair. Once you eliminate 1, 2, & 3, 4 & 5 are all thats remaining.
BC
1- bad caliper (pistons will not retract)
2- Caliper slider pins seized (wont allow caliper to move side to side)
3- Bad BPMV (will not allow front brake pressure circuit to vent back to the master cylinder.
4. Bad master cylinder.
5. Never seen a bad booster but I would check the bulletin to see what it says.
Problems 1, 2, & 3 are easy to check and repair. Once you eliminate 1, 2, & 3, 4 & 5 are all thats remaining.
BC
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There are a few things that will cause brakes to drag:
1- bad caliper (pistons will not retract)
2- Caliper slider pins seized (wont allow caliper to move side to side)
3- Bad BPMV (will not allow front brake pressure circuit to vent back to the master cylinder.
4. Bad master cylinder.
5. Never seen a bad booster but I would check the bulletin to see what it says.
Problems 1, 2, & 3 are easy to check and repair. Once you eliminate 1, 2, & 3, 4 & 5 are all thats remaining.
BC
1- bad caliper (pistons will not retract)
2- Caliper slider pins seized (wont allow caliper to move side to side)
3- Bad BPMV (will not allow front brake pressure circuit to vent back to the master cylinder.
4. Bad master cylinder.
5. Never seen a bad booster but I would check the bulletin to see what it says.
Problems 1, 2, & 3 are easy to check and repair. Once you eliminate 1, 2, & 3, 4 & 5 are all thats remaining.
BC
Thanks
Team Owner
Joined: Jan 2004
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From: NJ
Could be a few things.
1) Get front end up in the air, let it sit for 15 minutes or so without touching the brakes.
2) Spin each front tire to get an idea of the resistance.
3) Have someone get in and depress the pedal a few times and let go.
4) Check the tire spin again, if one or both are sticking (or still sticking) crack open the brake hose banjo bolt to see of the spin resistance changes. If the "grab" goes away, the issue is NOT the caliper/sliders/pads.
5) At this point, replace both front hoses.
6) If loosening the brake hoses makes no difference, the issue is in the caliper/sliders/pads. Replace calipers/pads/sliders and lube every slider.
If after these troubleshooting tips, the grab is still there, break out the check book.
1) Get front end up in the air, let it sit for 15 minutes or so without touching the brakes.
2) Spin each front tire to get an idea of the resistance.
3) Have someone get in and depress the pedal a few times and let go.
4) Check the tire spin again, if one or both are sticking (or still sticking) crack open the brake hose banjo bolt to see of the spin resistance changes. If the "grab" goes away, the issue is NOT the caliper/sliders/pads.
5) At this point, replace both front hoses.
6) If loosening the brake hoses makes no difference, the issue is in the caliper/sliders/pads. Replace calipers/pads/sliders and lube every slider.
If after these troubleshooting tips, the grab is still there, break out the check book.
Le Mans Master
Joined: Sep 2003
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From: Longview Texas
Could be a few things.
1) Get front end up in the air, let it sit for 15 minutes or so without touching the brakes.
2) Spin each front tire to get an idea of the resistance.
3) Have someone get in and depress the pedal a few times and let go.
4) Check the tire spin again, if one or both are sticking (or still sticking) crack open the brake hose banjo bolt to see of the spin resistance changes. If the "grab" goes away, the issue is NOT the caliper/sliders/pads.
5) At this point, replace both front hoses.
6) If loosening the brake hoses makes no difference, the issue is in the caliper/sliders/pads. Replace calipers/pads/sliders and lube every slider.
If after these troubleshooting tips, the grab is still there, break out the check book.
1) Get front end up in the air, let it sit for 15 minutes or so without touching the brakes.
2) Spin each front tire to get an idea of the resistance.
3) Have someone get in and depress the pedal a few times and let go.
4) Check the tire spin again, if one or both are sticking (or still sticking) crack open the brake hose banjo bolt to see of the spin resistance changes. If the "grab" goes away, the issue is NOT the caliper/sliders/pads.
5) At this point, replace both front hoses.
6) If loosening the brake hoses makes no difference, the issue is in the caliper/sliders/pads. Replace calipers/pads/sliders and lube every slider.
If after these troubleshooting tips, the grab is still there, break out the check book.
Brake hoses can look fine on the outside and deteriorate on the inside. The rubber can come loose and form a check valve inside the line, thus keeping the pressure on the caliper. I had this happen on one of my other cars.
Only mine would never release by setting. One side locked and stayed locked until the rotor turned blue.