Brake Systems - DELCO-Moraine Automatic Adjuster: Operation
NOTE:
Corvettes with special large high performance brakes have adjuster mounted on primary shoe; therefore, brake adjustment takes place during forward brake applications.
The adjusters operate only when brakes are applied as car is moving in reverse. The link which holds top of actuating lever stationary, forces lever to pivot on secondary shoe. This pivoting action forces pawl downward against end of a tooth on the star wheel adjusting screw. If lining-to-drum clearance is correct, the downward movement will stop before star wheel is turned. If clearance is too wide, the secondary shoe will move outward and the pawl will move downward far enough to turn star wheel one notch and take up the adjustment. Should the star wheel become frozen, or clearance be too excessive, the override mechanism will act to prevent the movement and binding of automatic adjuster linkage.