I just adjusted my parking break in my 83 300sd by using the star wheels inside the back wheels, and by adding a bit of tension in the cam adjustment underneath the car. I went to park on a hill and the parking break works great, but the regular breaks seem a but less effective.

Is my mind playing tricks on me? BTW, I drove my wife's Subaru to the parts store about two hours earlier, and didn't dive the MBZ until after I adjusted the parking break.