How do you adjust the rear drum brakes on a 2002 Hyundai Sonata?

On the steering knuckle by the brake rotor , passenger side on the 6 cyl. 2.7 Did you do a brake job lately or wheel bearing job? Probably just got dirty. Blow it off "LIGHTLY" with compressed air. I had a wheel bearing job done , got it back from the shop and got aq check engine light. I just blew it off with air, (once again, LIGHTLY ). Those bad dogs cost too much to be bustin them up !!