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If the spring brakes are engaged, when is it appropriate to push the brake pedal?
Always
Only during emergency situations
When the vehicle is in motion
Never
The correct answer is: Never
When spring brakes are engaged, it indicates that the vehicle's brake system is in a safe, locked position, usually because the vehicle is stationary or there has been a loss of air pressure in the primary brake system. In this situation, pushing the brake pedal is not appropriate because it could lead to dangerous outcomes, such as losing control or causing unexpected movement if the spring brakes were to release under pressure. Engaging the brake pedal while the spring brakes are engaged does not effectively contribute to the braking process, as the spring brakes serve their purpose of holding the vehicle stationary. The safest practice in this situation is to avoid pushing the brake pedal altogether, ensuring that the vehicle remains secure and preventing potential accidents or injuries.