FREE CDL Air Brake Parking and Emergency Brakes Questions and Answers

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What activates the parking brakes in an air brake system?

Correct! Wrong!

Parking brakes in air brake systems are spring brakes. These are applied by powerful springs that engage when air pressure is lost or intentionally removed (e.g., when the parking brake is set).

When should you use parking brakes?

Correct! Wrong!

Parking brakes should always be used to hold the vehicle stationary when parked. However, avoid using them when brakes are overheated (to prevent damage) or in freezing conditions (to prevent freezing of brake components).

What should you do if your parking brakes won’t release due to frozen brake components?

Correct! Wrong!

Frozen brake components should be warmed using safe methods such as heaters or heat lamps. Pouring hot water can cause components to refreeze and worsen the problem.

When do spring brakes automatically engage in a failure situation?

Correct! Wrong!

Spring brakes are a fail-safe mechanism that automatically engage when air pressure in the system falls below the threshold of 20-45 psi. This ensures the vehicle stops if the air system fails.

Can spring brakes and service brakes be applied simultaneously?

Correct! Wrong!

Spring brakes and service brakes should not be applied simultaneously, as this can cause damage to the brake components. Spring brakes are for parking and emergencies, while service brakes are used for regular braking.

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