need help for the pros for TJ front brakes that stick
01-04-2005, 02:15 PM
#11
Guest
Posts: n/a
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.
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.
01-04-2005, 02:15 PM
#12
Guest
Posts: n/a
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.
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.
01-04-2005, 02:15 PM
#13
Guest
Posts: n/a
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.
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.
01-04-2005, 09:00 PM
#14
Guest
Posts: n/a
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.
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.
01-04-2005, 09:00 PM
#15
Guest
Posts: n/a
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.
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.
01-04-2005, 09:00 PM
#16
Guest
Posts: n/a
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.
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.
01-04-2005, 09:13 PM
#17
Guest
Posts: n/a
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.
>
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.
>
01-04-2005, 09:13 PM
#18
Guest
Posts: n/a
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.
>
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.
>
01-04-2005, 09:13 PM
#19
Guest
Posts: n/a
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.
>
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.
>
01-05-2005, 01:24 AM
#20
Guest
Posts: n/a
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
>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
