Faulty brake booster

A faulty brake booster reduces braking power, making it harder to press the brake pedal and increasing stopping distances. Symptoms include a hard brake pedal, hissing noises when pressing the brakes, or the engine stalling when braking due to a vacuum leak in the booster. The brake booster uses engine vacuum to assist in applying brake pressure, so any failure results in significantly increased pedal effort. Causes of failure include a leaking vacuum hose, a ruptured diaphragm, or a faulty check valve. Ignoring a failing brake booster makes stopping more difficult and increases driver fatigue. If a hard brake pedal or stalling when braking occurs, the booster should be inspected and replaced immediately to restore proper braking assistance.

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