Had my bird in the shop now twice, because the rear calipers seem to be sticking. Already replaced one of the new ones with another. Still the same problem. Could this be a parking brake problem somehow? Poor quality calipers? Parking brake linkage and spring on the back of the caliper hosed? When they redid them the 2nd time, they resurfaced rotors and also put new pads on again. I got under there last night and noticed the parking brake spring was stuck again. Any opinions on this would be greatly appreciated. The guys at the brake shop, have been doing brakes for quite awhile.