Michigan CDL - Air Brakes Practice Exam

Question: 1 / 400

How do you release the spring brakes?

By pressing the brake pedal

By applying air pressure to the brake chambers

Releasing the spring brakes involves applying air pressure to the brake chambers. When a vehicle is equipped with air brakes, the spring brakes are designed to engage automatically when the air pressure falls below a certain level, thus ensuring that the vehicle does not roll away when parked. To release these spring brakes, an adequate amount of air pressure must be supplied to the system, which pushes against the spring mechanism and frees the brakes for operation.

This process is essential for the safe and effective functioning of air brake systems. Proper air pressure is maintained by the compressor while driving, and when the driver applies the brakes using the brake pedal, this also helps maintain the correct air pressure in the system required for brake release. Thus, understanding the role of air pressure in this context is critical for safe vehicle operation.

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By pulling a lever inside the cab

By turning the ignition key

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