Manitoba Airbrake Practice Exam

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What is the purpose of the safety valve?

Regulating airflow
Protects the supply reservoir from becoming over-pressurized and bursting
Ensures even brake wear
Controls the air pressure to the brakes

The correct answer is: Protects the supply reservoir from becoming over-pressurized and bursting

The purpose of the safety valve is to protect the supply reservoir from becoming over-pressurized and bursting. This is not the same as regulating airflow (A), which is the role of the automatic slack adjuster. It also is not related to ensuring even brake wear (C), which is the function of the brake proportioning valve. Similarly, it is not responsible for controlling the air pressure to the brakes (D), which is the job of the relay valve. Safety valves are unique in their purpose of preventing potential damage or hazards and maintaining the integrity of the air brake system.