c220 sticking parking brake
 

I have recently bought another c220, but the car has developed a problem,
when he parking brake is applied , the parking brake does not release when the handle is pulled and the dashboard light stays on, the handle seems very slack, but the foot pedal is very stiff to push down to engage, but if you put your foot under the foot pedal and push it up the light goes out and the car drives normally, doesanybody have any ideas thanks, also while i was parked in a narrow street some kind soul decided to clip my drivers side wing mirror and I cant seem to push it back on thanks Steve