Which of the following is NOT a component of a brake system?

The correct answer is C, as windshield wipers are not part of a brake system. The brake system in a vehicle primarily consists of components that are specifically designed to slow down or stop the vehicle. This includes brake fluid, which is essential for transferring force within the brake system, allowing the brakes to function effectively. The service brake system refers to the primary system used for normal braking operations, while the emergency stopping system is a backup mechanism designed to engage in case of failure of the primary system.

Windshield wipers, on the other hand, are part of the vehicle's visibility and comfort features, designed to clear rain, snow, and debris from the windshield. They do not contribute to the functionality of the braking system, thereby distinguishing them from the other components listed that are integral to the operation of brakes.