The front brakes on a 1987 535iS will not fully release until the cars sits & cools down. This is not just a little drag, they are on to the point of seriously affecting acceleration. The passenger side rotor is very hot, driver side seems much less affected. Problem does not occur right after a cold startup, it has to be driven a few miles. Get this...it also happened once just by running the car in the driveway until hot (it was a very hot day). Pads are new & not hanging up, also has new rubber brake hoses & fluid. This car has a hydraulic brake booster - could it somehow be self applying? At this point I'm not sure if the problem is with the master cylinder, the hydraulic brake booster or something else. Charlie B.