front caliper drag
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Fleet Mechanic
Joined: Nov 2000
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From: In my House
front caliper drag
So i replaced both front cv axles recently, and i did rotors and front shocks while in there also. What i did notice afterward is that the pass side runs hotter than drivers side. I went for a ride and when I came home, i jacked the truck up and both front wheels had some pretty good drag to them. I let it cool down a few hours and they spun fine. Do you think its calipers that are bad? they are original with 165k.......I replaced the front brake hoses last winter, so it cant be them.......Any ideas?
Lead Driver
Joined: Sep 2006
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Remove the calipers and pads.
Use a C clamp or suitable tool to fully compress the pistons into the housing without damage to the seals..
This should clear any tendency to stick from the old operating positions at least for a short time..
The calipers must float freely, self center and take the full pressure off the pads except for a small normal amount.
Look at the pads to see if one shows more wear than it's mate.
Until you do these observations and checks, you can't get a direction to go in.
Also when torqueing the wheel lug nuts be careful not to over tighten. This can distort the disc, put a wave in it and become temperature sensitive to braking time. It shows up as a pulsing braking during stopping at different times..
Use a C clamp or suitable tool to fully compress the pistons into the housing without damage to the seals..
This should clear any tendency to stick from the old operating positions at least for a short time..
The calipers must float freely, self center and take the full pressure off the pads except for a small normal amount.
Look at the pads to see if one shows more wear than it's mate.
Until you do these observations and checks, you can't get a direction to go in.
Also when torqueing the wheel lug nuts be careful not to over tighten. This can distort the disc, put a wave in it and become temperature sensitive to braking time. It shows up as a pulsing braking during stopping at different times..
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Fleet Mechanic
Joined: Nov 2000
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From: In my House
....Figured this might have been the reason for the excess heat. But I put a new caliper in today and bleed the system, so i have no more drag...figured all was fixed, so i too the truck on a 150 mile trip today and the dam outer cv joint housing is hot as hell!! The drivers side is just warm. WTF!! So is it the bearing now? or is the new cv joint I put in bad?? I can remove the caliper and spin the hub by hand and i do feel drag, but nothing like a bad bearing would feel...... Who knows how long its even been like this, because only reason i switched out the axle was because it had a small tear in the boot........Im at a loss
Lead Driver
Joined: Sep 2006
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If the bearing Pak is loose, the disc will move in relation to the Caliper.
That is not supposed to happen. To check this, jack the wheel up so you can move it.
Try moving the wheel both vertical and horizontal while watching the disc in the caliper area.
If there is lateral movement between the two, bearing pack is bad.
With a problem like this the disc will rub the pads just from the weight of the truck slanting the disc between the pads.
That will surely generate heat and wear the pads uneven over time.
Good luck..
That is not supposed to happen. To check this, jack the wheel up so you can move it.
Try moving the wheel both vertical and horizontal while watching the disc in the caliper area.
If there is lateral movement between the two, bearing pack is bad.
With a problem like this the disc will rub the pads just from the weight of the truck slanting the disc between the pads.
That will surely generate heat and wear the pads uneven over time.
Good luck..
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Fleet Mechanic
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From: In my House
Bluegrass, I checked like you had mentioned and it doesnt seem as if theres a bearing issue...I have no play in the bearing..........At this point im going to se if they can swap out my cv axle with another.....Its the only thing left!
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when you take the nut off the axle end, push the axle stub inward thru the bearing hub to see that it is not too long and pushing outward on the hub.... Don't know if its possible, but on our 2002 EXP one rear half shaft is 1 inch longer than the other side... Get them mixed up and the one is TOO LONG and pushes on the hub when installed............ YEP...... I measured 3 times and STILL MANAGED to put the wrong half shaft on the wrong side !! several years ago.
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Fleet Mechanic
Joined: Nov 2000
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From: In my House
Thanks Steve.......I did measure the old one again versus the new one.....it was the same.........Im having a new shaft brought in tommorrow.......Hopefully that will solve the issue....Ill keep you all posted...Thanks
Cargo Master
Joined: Jul 2009
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From: Des Moines
A wheel bearing can be bad/failing and show no external signs of it. It’s possible the problem existed before the axle swap and it took removing the axle for it to reveal itself.
If the new axle doesn’t fix it then you’ll likely be replacing the bearing. It may be worth it for you to invest in an infrared thermometer (or rent one if you can) so you can get an actual measurement of the temp on the wheel hub.
If the new axle doesn’t fix it then you’ll likely be replacing the bearing. It may be worth it for you to invest in an infrared thermometer (or rent one if you can) so you can get an actual measurement of the temp on the wheel hub.
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