All 4 calipers locking up any ideas? (4 Viewers)
- Thread starter 05ls430518
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Semi-stupid question, but (with the truck off) if you raise both front wheels off the ground, do they turn freely (one forward, the other backwards because of the open differential), or are they hard to turn like the brakes are binding? They should turn relatively easily. Same question for the rear (with the parking brake off).
But as I recall, the truck did not overheat the brakes prior to the aftermarket rotor/pad replacement. There was just the scraping sound from heavily worn rear brakes.
If it’s all 4 that are hot, not just the rear, the FSM says to check pedal free play. Otherwise the only commonality is the booster you’ve already replaced.
- Thread starter
- #45
So my ego is not to big to admit I have no idea whats causing this could be a chewed on wire could be any other number of things. I am having it flatbedded to my friends shop and I am going to have him look at it, and figure out what is causing the issue.
I appreciate everyone sharing there knowledge and trying to help solve this issue its greatly appreciated. I will post what the problem is soon as its uncovered.
I appreciate everyone sharing there knowledge and trying to help solve this issue its greatly appreciated. I will post what the problem is soon as its uncovered.
You’ve added a lot to the knowledge base here with the booster/MC replacement writeup. It’ll be good know the source of that odd problem.
- Thread starter
- #47
So update its in my friends shop still can't find what's wrong wheels spin freely on a lift he is driving it around and going to use his thermal imager with him to check the hubs etc
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Do you still have the original rotors? Compare them VERY CLOSELY to the Centric rotors you installed. Even better: re-install the originals temporarily (if they aren’t damaged) and see if the problem goes away. I’ve seen after market rotors that were machined slightly out of tolerance and the rotor face was too offset to one side, or the diameter was wrong and didn’t contact the entire pad, etc. It happens and is worth looking into.
Are you certain it’s *all four* brakes that are dragging after driving? Or could it be just one or two wheels?
And they *don’t* drag while cold?
Are you certain it’s *all four* brakes that are dragging after driving? Or could it be just one or two wheels?
And they *don’t* drag while cold?
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- Thread starter
- #49
I have the old ones still I will take a look I am 100% positive all 4 sides are experiencing heat I go around the truck put some water on the rotors and the water sizzle's for all 4 corners. I do not know if they drag when cold no way to tell, I am assuming they do because after 5ish minutes of driving stuff gets hot.
So what if its not the pads rotors caliper. Is it possible all 4 wheel bearings are bad what else would cause excessive heat in all 4 hub areas. I am trying to think outside of the box maybe I misdiagnosed something or the brakes masked another issue.
Lock the center diff and let it idle in D while it’s on a lift. You’ll be able to hear any strange brake drag and see which tires are turning much slower than the others. Do this once while cold and then once again after you have driven it for 5 minutes.
Nope, not possible for all 4 wheel bearings running hot. That’s way too far outside the box. It’s 99.9% the brakes, since they didn’t run hot before you replaced them and did afterwards.
I'll just throw this out there. It's possible that you are getting interference from the backing plates on the rotors. This is usually isolated to the offending wheel, but if all 4 backing plates were somehow bent/warped, it may be a source of friction and associated heat. Worth checking anyways. Particularly if you are hearing awful noises.
Sometimes people accidentally bend the backing plates towards the rotors while doing brake work. The tolerances are pretty tight on the backing plates.
Sometimes people accidentally bend the backing plates towards the rotors while doing brake work. The tolerances are pretty tight on the backing plates.
