To adjust them properly, adjust the brake shoes before touching the cables. The brake shoes are adjusted with a star wheel on each side, from the rear of the backing plate. Once they are adjusted properly, then you can adjust the cable if necessary (but it is very likely that if the shoes are adjusted properly, you won't have to adjust the cable at all).

__________________
2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue