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The service brake system

A Applies and releases the brakes when you press the brake pedal while driving normally
Explaination
Air brakes consists of three separate braking systems: the service brake system, the parking brake system, and the emergency brake system. The service brake system applies and releases the brakes when you use the brake pedal while driving normally.
B Applies and releases the parking brakes
C Applies and releases the emergency brake
D Applies and releases the axle brake