Chrysler Repair: Chrysler 2008 t/c brakes, rear disc brakes, caliper piston

Question

brake caliper My rear disc brakes frequently overheat.  Sometimes it is the right rear, sometimes the left.  The alloy wheel becomes hot to the touch, and the acrid smell of brake pads can be smelled.  Upon wheel removal, the disc rotors look smooth, and are not warped, but there is more drag than should appear normal.  It is barely possible to turn the rotors with one hand.  The parking brake adjusters appear to work normally, and retract to the fully "relaxed" position on each wheel. Retract springs are OK.   But yet the brakes are still too tight.  Today the dealer says I have to pay for new pads and rotors, as they have been overheated ( no kidding) and that will make the problem go away.  This is the car with the parking brake actuation device buried within the caliper piston housing -- some sort of jack screw.  I cannot understand how just putting new pads / rotors on it will cure the cause of the problem.  I wonder if the caliper internal parking mechanism is at fault???? thanks

Answer
Hi Garrett,
I wonder if there might be some drag between the calipers and the pin(s) on which they ride laterally. You might try cleaning those surfaces and lubing them with a slight amount of silicone grease. About the only other basis for a failure to retract is when the inner lumen of the rubber brake line is clogging up due to aging/deterioration (but overheating might due the same thing premturely) so you might try replacing the brake hoses that connect the solid brake lines to the calipers.
I hope you will get some success trying either/both those approaches.
Roland
PS Sorry for the delay but I just found your question in the 'pool' to which the other expert had refered it. Please 'rate' my answer, and where you see the question about 'volunteer of the month' consider giving me a 'yes' answer. Thanks