When the brake wear sensor is replaced does it have to be reset by the dealer (it doesn't on BMWs but haven't done this on a Mini before)? Bentley manual just says replace it. Light is still on. When replacing the rear brakes I noticed that the rear wheel bearing seemed very stiff, expecially the RR, even with the brakes removed. Has anyone noticed this? The RR brake may be draging which may have overheated the bearing. You can press the rear brake pistons back into the caliper using a generic tool for rotating the piston in that is available at most automotive stores and a C-clamp. The piston face has four holes used for rotation. I had one that is a cube with different size and spaced pins on each face, but none or them fit so I used a file to modify a set that was slightly too wide. Some Fords and others use this tool and only require rotation, but the Mini requries rotation and compression at the same time. So put the tool on the caliper piston, with pins in two opposing holes and put a C-clamp (6 in or bigger) on the caliper and apply some pressue, not a lot, to the rotation tool. Use a wrench to turn the rotation tool to the right. Tighten the C-clamp a little and repeat.