All 4 calipers locking up any ideas? (3 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?
View attachment 3972889

View attachment 3972890

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.