All 4 calipers locking up any ideas? (2 Viewers)

[40Man]

If there is air in the line it can prevent the pistons from fully retracting into the calipers. I'd go through the FSM procedures to bleed again.

 

[marques]

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).

 

[Sandroad]

So rod length is the same, there is no stored codes or pending codes I am stumped. The truck did this with the original oem calipers also that's what led me to replace all 4 calipers.


I am open to any ideas at this point the brake booster master cylinder is defective, along with all 4 calipers, voodoo anyone have anything?
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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.

 

[linuxgod]

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.

 

[05ls430518]

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.

 

[Sandroad]

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.

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.