Michigan CDL - Air Brakes Practice Exam

The service brake is primarily designed for normal driving conditions and is used for routine stopping and controlling the vehicle's speed. It is engaged routinely when the driver presses the brake pedal, allowing for smooth and controlled decreases in speed during regular driving scenarios.

In contrast, the emergency brake, also known as the parking brake or hand brake, is specifically intended for emergency situations or to secure the vehicle when parked. It serves to prevent the vehicle from rolling when not in use and can be activated manually by the driver. This distinction is crucial for safely managing different driving scenarios and ensuring the vehicle remains stationary when it needs to be.

The service brake system is often more complex and powerful to accommodate the range of stopping needs during regular operation, while the emergency brake is simpler and serves as a backup system to provide an additional layer of safety.