Just changed the front pads on my 2002 Allroad. The type of system with 4 pads per caliper. No problems before I changed them with binding brakes, but I had problems with the offside caliper retracting the pistons, the seal had come off around the top piston so I think it might be sticking. I'm occasionally getting a hot brake on that side now. However the car does roll under gravity on a very slight incline. Has anybody else had this? How easy are the calipers to remove and overhaul? Also, in the car's toolbox for the jack etc. should there be some sort of spigot tool that screws into a wheel bolt hole on the hub to help take the weight of the wheel and guide it on when refitting? thanks