Adjust the parking brake at the shoes, you should never adjust with the cable. You will eventually run out of cable, and the parking brake will not work.
It is only neccessary to remove one lug bolt to adjust, a brake tool or large screwdriver will fit nicely through the hole, and the adjuster is in exactly the correct place to do this. Only takes a minute or two.
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!