Originally Posted by Graham

I would at least look at the caliper seals. If they have deteriorated, the lip seal won't retract the piston. Had that happen, and new caliper seals solved problem.

Also had one rear hose collapse internally once, but that caused total lock up of brake. I suppose lesser restriction might cause dragging as suggested upthread.

Recently replaced hoses (and corroded tubing) all round. Also have new (or rebuilt) calipers all round. Stil on original MC. (1985 300D)

Originally Posted by leathermang

The lip seal does not function in that manner... there is no mechanism for retracting the pad.... they just sit next to the rotor.. or they push on it....

Originally Posted by Graham

I am not going to argue, but that is the way it is explained in many references including the one I posted upthread.