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Bleed the complete system starting with the rear passenger caliper if you don't have a bleed box get someone to help you and have them pump the brakes three to five times and hold it down then open the little 3/8 bleeder located on the inner side of the caliper the brake pedal will go to the floor but make sure they do not release the pedal until you close the bleeder back up then repeat until there is no air in the lines then move to the rear driver side repeat steps above then front passenger side then front driver side. hope this helps Jeff J&D services
Are there two brake fluid reservoirs? And are both full? This would be a split-diagonal brake system-front driver and rear passenger are one brake system. Front passenger and rear driver are the other system. You have the one system working-the front passenger and rear driver side works. You will have to keep bleeding the rear passenger side and the front driver side-always start farthest from the master cylinder, but if that wheel just won't bleed air out, make sure the driver front is working and bleeds good. If all else fails, there are pressure bleeder kits available, I don't know the cost, but they work great. They are also a one man bleeding job, as I understand.
You say they replaced basicly everything that involes the rear brakes.
Every step they took to find the problem could lead to the solution,BUT
did they check the inboard brakes. The brake system on a jeep that has
rear rotors have inboard shoes for the parking brake.
You could have a parking brake cable that is frozen (this will cause a
drag on the inboard brakes. Do you use the parking brake? Maybe the
parking brake shoes are adjusted too tight?
todays sports utility vehicles are equiped with a proportioning valve. they are usualy located at the rear of the vehicle. this valve regulates the flow of brake fluid to the calipers. most suv`s have a ride control arm on them that is linked to the rear suspension to apply more braking force to the rear wheels in a harsh or sudden stop. if this valve is bad or malfunctioning even body roll can redirect brake fluid to the rear wheels causing them to lock up., hope this info helps
Have someone push & release pedal while at wheel with problem. See if it takes a while or slow to release. If yes, have wrench ready on bleeder screw, and try again, if it sticks/holds, crack bleeder screw, if it releases, I'd replace hose.
You can rent at basically no cost a brake rewind tool from Auto-Zone (at least the one by me let me do it). You need to apply pressure while turing clockwise on the passenger rear side, and applying pressure and turning counter-clockwise on the drivers rear side. Good luck. My experience tells me these can be a little stubborn. It just takes time and a little pressure.