Question

1. a vehicle with power assist brakes has a hard brake pedal with little stopping power. which of these is the most likely cause of this condition? the brake booster. the master cylinder. air in the system. contaminated brake fluid.

Explanation:

The brake booster in power - assist brakes amplifies the force applied to the brake pedal. A faulty brake booster can result in a hard brake pedal with little stopping power. The master cylinder issues usually cause a soft or spongy pedal. Air in the system causes a soft pedal, and contaminated brake fluid may lead to component damage but not a hard pedal as directly as a bad booster.

Answer:

The brake booster.