As a further note:
All-disc systems "self-adjust" every time the brake pedal is pressed.
Disc-drum systems adjust one of three ways:
1. You get under the car w/ the tools & adjust the rear brakes per recommended procedure.
2. Depending on vehicle design - self-adjust when brakes are applied while rolling in reverse.
3. Depending on vehicle design - self-adjust for every use/release of the emergency brake.
Check it out!!
