ASE School Bus Technician Brakes Certification (S4) Practice 2025 – All-in-One Guide to Master Your Certification Exam!

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What are symptoms of a failing brake booster?

Increased engine noise and vibrations

Increased effort to press the brake pedal and longer stopping distance

A failing brake booster typically leads to increased effort required to press the brake pedal and can result in a longer stopping distance. The brake booster operates by using engine vacuum to assist in applying the brakes, making it easier for the driver to engage the braking system. When the booster starts to fail, this vacuum assistance diminishes, requiring significantly more force from the driver to achieve the same braking effect. Consequently, the vehicle may not stop as efficiently or quickly as expected, heightening the risk of accidents due to increased stopping distance.

Understanding this function helps to diagnose issues with the braking system effectively. In a properly functioning brake system, minimal effort is needed to stop, while signs of a brake booster failure will be clear through noticeable changes in how the brakes feel during operation.

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Frequent overheating of the brakes

Unusual sounds when braking

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