DIY Sticky parking brake pedal FIXED
Over the years, parking brake pedal gets sticky (first video). This can be due to many problems since there are many parts involved. But the problem in my car was the dry and sticky spring of the parking brake pedal. Since this is a very easy fix, lubricating this spring can be tried first (see the second video). Problem is that you don't see the spring when you remove the footwell cover. What you need to do is to remove the side panel of the dashboard, single torx screw, then top cover of the footwell and lastly two screws holding the lower dash. Now you can pull the dashboard and spray it with your choice of lubricant.
If this does not solve your issue; there are 3 separate cables that you should check: from the pedal assembly to the lever (85), and from the lever to the brake pads in both rear wheels. See this link for stuck cable: http://www.benzworld.org/forums/w163-m-class/1405114-parking-brake-stuck-2000-ml-320-a.html
Over the years, parking brake pedal gets sticky (first video). This can be due to many problems since there are many parts involved. But the problem in my car was the dry and sticky spring of the parking brake pedal. Since this is a very easy fix, lubricating this spring can be tried first (see the second video). Problem is that you don't see the spring when you remove the footwell cover. What you need to do is to remove the side panel of the dashboard, single torx screw, then top cover of the footwell and lastly two screws holding the lower dash. Now you can pull the dashboard and spray it with your choice of lubricant.
If this does not solve your issue; there are 3 separate cables that you should check: from the pedal assembly to the lever (85), and from the lever to the brake pads in both rear wheels. See this link for stuck cable: http://www.benzworld.org/forums/w163-m-class/1405114-parking-brake-stuck-2000-ml-320-a.html