If the spring brakes are on, when should you press the brake pedal?

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Multiple Choice

If the spring brakes are on, when should you press the brake pedal?

Explanation:
Spring brakes are the parking/emergency brakes in air brake systems. They’re applied by powerful springs and released only when air pressure is supplied to release them. When the spring brakes are on, you already have braking force from those springs. The brake pedal controls the service brakes by sending air pressure to the brake chambers, but it does not release the spring brakes. Therefore pressing the brake pedal while the spring brakes are on won’t disengage them and isn’t the proper action. Before moving, you need to restore air pressure to release the spring brakes and then use the service brakes as needed.

Spring brakes are the parking/emergency brakes in air brake systems. They’re applied by powerful springs and released only when air pressure is supplied to release them. When the spring brakes are on, you already have braking force from those springs. The brake pedal controls the service brakes by sending air pressure to the brake chambers, but it does not release the spring brakes. Therefore pressing the brake pedal while the spring brakes are on won’t disengage them and isn’t the proper action. Before moving, you need to restore air pressure to release the spring brakes and then use the service brakes as needed.

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