What component typically aids in the operation of disc brakes?

The brake caliper is an essential component in the operation of disc brakes. It is responsible for housing the brake pads and using hydraulic pressure to press these pads against the spinning disc (or rotor) when the brake pedal is engaged. This action creates friction, which slows down or stops the vehicle. The efficiency of disc brakes largely relies on the brake caliper's proper function, as it ensures an even distribution of pressure across the brake pads, vital for optimal braking performance.

In contrast, the other options play different roles within a vehicle. The suspension system contributes to ride quality and handling but is not directly involved in the braking process. The steering wheel is the driver’s control interface for directing the vehicle but has no direct impact on how brakes operate. The clutch assembly is related to manual transmission vehicles and engages and disengages the engine from the transmission, which also does not affect the disc brake system directly. Therefore, the brake caliper is the correct choice for aiding in the operation of disc brakes.