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Re: need help for the pros for TJ front brakes that stick
That is strange. If it was one side.....
There is a combination valve that controls the front to rear wheel pressures and the Master Cylinder. Those are the only two places both wheels have in common. It is unusual for the combination valve to fail. I have seen masters fail so the front brakes won't release. I would test it by opening the line fitting for the fronts right at the master. If pressure squirts out and they release, the master has failed internally. (I just crack them, if under pressure it will come out fast first, then slow right down) If not, then I would open it somewhere after the combination valve on either side to look for the stored up pressure. If none there, then I would go to the wheel caliper and open it. If that is the only place to show built up line pressure, then that implies the rubber lines from the wheels to the frame have internally collapsed. It does happen. This only happens on one side at a time though usually unless someone put the wrong fluid into the brake reservoir. If it got the wrong fluid, both front hoses could have died. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's snowboardripper@hotmail.com wrote: > > I have a 2002 TJ with new pads in the front ( put on early summer). I > was driving to work this morning and the front brakes stayed on. I > could feel the resistance and noticed the smell, and the drag from the > front. Both front wheels were hot to touch. What causes both of them > to stay on? The jeep was in a garage overnight so they were not frozen. > I assume it must be the module that controls the braking, but if there > is anything I can check it would be a help. |
Re: need help for the pros for TJ front brakes that stick
That is strange. If it was one side.....
There is a combination valve that controls the front to rear wheel pressures and the Master Cylinder. Those are the only two places both wheels have in common. It is unusual for the combination valve to fail. I have seen masters fail so the front brakes won't release. I would test it by opening the line fitting for the fronts right at the master. If pressure squirts out and they release, the master has failed internally. (I just crack them, if under pressure it will come out fast first, then slow right down) If not, then I would open it somewhere after the combination valve on either side to look for the stored up pressure. If none there, then I would go to the wheel caliper and open it. If that is the only place to show built up line pressure, then that implies the rubber lines from the wheels to the frame have internally collapsed. It does happen. This only happens on one side at a time though usually unless someone put the wrong fluid into the brake reservoir. If it got the wrong fluid, both front hoses could have died. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's snowboardripper@hotmail.com wrote: > > I have a 2002 TJ with new pads in the front ( put on early summer). I > was driving to work this morning and the front brakes stayed on. I > could feel the resistance and noticed the smell, and the drag from the > front. Both front wheels were hot to touch. What causes both of them > to stay on? The jeep was in a garage overnight so they were not frozen. > I assume it must be the module that controls the braking, but if there > is anything I can check it would be a help. |
Re: need help for the pros for TJ front brakes that stick
That is strange. If it was one side.....
There is a combination valve that controls the front to rear wheel pressures and the Master Cylinder. Those are the only two places both wheels have in common. It is unusual for the combination valve to fail. I have seen masters fail so the front brakes won't release. I would test it by opening the line fitting for the fronts right at the master. If pressure squirts out and they release, the master has failed internally. (I just crack them, if under pressure it will come out fast first, then slow right down) If not, then I would open it somewhere after the combination valve on either side to look for the stored up pressure. If none there, then I would go to the wheel caliper and open it. If that is the only place to show built up line pressure, then that implies the rubber lines from the wheels to the frame have internally collapsed. It does happen. This only happens on one side at a time though usually unless someone put the wrong fluid into the brake reservoir. If it got the wrong fluid, both front hoses could have died. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's snowboardripper@hotmail.com wrote: > > I have a 2002 TJ with new pads in the front ( put on early summer). I > was driving to work this morning and the front brakes stayed on. I > could feel the resistance and noticed the smell, and the drag from the > front. Both front wheels were hot to touch. What causes both of them > to stay on? The jeep was in a garage overnight so they were not frozen. > I assume it must be the module that controls the braking, but if there > is anything I can check it would be a help. |
OT: Mike you are back?
Mike:
How was your 5 day bush run? Tom "Mike Romain" <romainm@sympatico.ca> wrote in message news:41DAEB3F.C7F37DF4@sympatico.ca... > That is strange. If it was one side..... > > There is a combination valve that controls the front to rear wheel > pressures and the Master Cylinder. Those are the only two places both > wheels have in common. |
OT: Mike you are back?
Mike:
How was your 5 day bush run? Tom "Mike Romain" <romainm@sympatico.ca> wrote in message news:41DAEB3F.C7F37DF4@sympatico.ca... > That is strange. If it was one side..... > > There is a combination valve that controls the front to rear wheel > pressures and the Master Cylinder. Those are the only two places both > wheels have in common. |
OT: Mike you are back?
Mike:
How was your 5 day bush run? Tom "Mike Romain" <romainm@sympatico.ca> wrote in message news:41DAEB3F.C7F37DF4@sympatico.ca... > That is strange. If it was one side..... > > There is a combination valve that controls the front to rear wheel > pressures and the Master Cylinder. Those are the only two places both > wheels have in common. |
Re: need help for the pros for TJ front brakes that stick
It does seem strange that both fronts would stick at the same time. To me,
that is an indication of some sort of hydraulic problem as Mike said. I would check the caliper slides though to see that they are cleaned and greased properly. If you do need new rotors, most auto parts stores (at least in the Cleveland, Ohio area) have the wrong part numbers for the '02 TJ. My '02 TJ was built on 07/2001 so it was a very early production '02 model. It uses full cast rotors, whereas the '01's and earlier used a composite rotor. The full cast is a much better rotor, and is more resistant to warping. The correct part numbers for a full-cast rotor for '02 TJ's are: Bendix: 145276 Wagner: BD125716 Raybestos: 76923 Aimco: 5396 Any of the above numbers will fit, but the '01 composite rotors are NOT interchangeable and will not work. Here is a great write-up for disk brake service if you decide to do the work yourself. http://www.stu-offroad.com/misc/frontbrakes-1.htm Tom "Mike Romain" <romainm@sympatico.ca> wrote in message news:41DAEB3F.C7F37DF4@sympatico.ca... > That is strange. If it was one side..... > > There is a combination valve that controls the front to rear wheel > pressures and the Master Cylinder. Those are the only two places both > wheels have in common. > > It is unusual for the combination valve to fail. > > I have seen masters fail so the front brakes won't release. > |
Re: need help for the pros for TJ front brakes that stick
It does seem strange that both fronts would stick at the same time. To me,
that is an indication of some sort of hydraulic problem as Mike said. I would check the caliper slides though to see that they are cleaned and greased properly. If you do need new rotors, most auto parts stores (at least in the Cleveland, Ohio area) have the wrong part numbers for the '02 TJ. My '02 TJ was built on 07/2001 so it was a very early production '02 model. It uses full cast rotors, whereas the '01's and earlier used a composite rotor. The full cast is a much better rotor, and is more resistant to warping. The correct part numbers for a full-cast rotor for '02 TJ's are: Bendix: 145276 Wagner: BD125716 Raybestos: 76923 Aimco: 5396 Any of the above numbers will fit, but the '01 composite rotors are NOT interchangeable and will not work. Here is a great write-up for disk brake service if you decide to do the work yourself. http://www.stu-offroad.com/misc/frontbrakes-1.htm Tom "Mike Romain" <romainm@sympatico.ca> wrote in message news:41DAEB3F.C7F37DF4@sympatico.ca... > That is strange. If it was one side..... > > There is a combination valve that controls the front to rear wheel > pressures and the Master Cylinder. Those are the only two places both > wheels have in common. > > It is unusual for the combination valve to fail. > > I have seen masters fail so the front brakes won't release. > |
Re: need help for the pros for TJ front brakes that stick
It does seem strange that both fronts would stick at the same time. To me,
that is an indication of some sort of hydraulic problem as Mike said. I would check the caliper slides though to see that they are cleaned and greased properly. If you do need new rotors, most auto parts stores (at least in the Cleveland, Ohio area) have the wrong part numbers for the '02 TJ. My '02 TJ was built on 07/2001 so it was a very early production '02 model. It uses full cast rotors, whereas the '01's and earlier used a composite rotor. The full cast is a much better rotor, and is more resistant to warping. The correct part numbers for a full-cast rotor for '02 TJ's are: Bendix: 145276 Wagner: BD125716 Raybestos: 76923 Aimco: 5396 Any of the above numbers will fit, but the '01 composite rotors are NOT interchangeable and will not work. Here is a great write-up for disk brake service if you decide to do the work yourself. http://www.stu-offroad.com/misc/frontbrakes-1.htm Tom "Mike Romain" <romainm@sympatico.ca> wrote in message news:41DAEB3F.C7F37DF4@sympatico.ca... > That is strange. If it was one side..... > > There is a combination valve that controls the front to rear wheel > pressures and the Master Cylinder. Those are the only two places both > wheels have in common. > > It is unusual for the combination valve to fail. > > I have seen masters fail so the front brakes won't release. > |
Re: need help for the pros for TJ front brakes that stick
On 4 Jan 2005 06:03:41 -0800, snowboardripper@hotmail.com wrote:
>I have a 2002 TJ with new pads in the front ( put on early summer). I >was driving to work this morning and the front brakes stayed on. I >could feel the resistance and noticed the smell, and the drag from the >front. Both front wheels were hot to touch. What causes both of them >to stay on? The jeep was in a garage overnight so they were not frozen. >I assume it must be the module that controls the braking, but if there >is anything I can check it would be a help. I've seen a mis-adjusted brake light switch cause this by not letting the brake pedal to fully return. It's worth a check. -- Dave in Columbus |
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