Question

what component in the manual parking brake system rotates the thrust screw/ball assembly to actuator the parking brake?
a) shaft
b) actuator lever
c) caliper piston
d) parking brake cable

Explanation:

In a manual parking brake system, the actuator lever is responsible for rotating the thrust screw/ball assembly to actuate the parking brake. The shaft is more related to transmitting rotational force in other mechanisms. The caliper piston is mainly involved in the hydraulic braking action (not directly in rotating the thrust screw for parking brake actuation in a manual - type mechanism as described). The parking brake cable transmits force but does not rotate the thrust screw/ball assembly.

Answer:

B. Actuator lever