Commercial Driver’s License (CDL) Practice Exam 2025 – All-in-One Guide to Master Your CDL Test!

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In a truck with dual parking control valves, what can you achieve using pressure from a separate tank?

Release the main brakes

Apply more brake pressure

Using pressure from a separate tank in a truck with dual parking control valves allows you to apply more brake pressure. This is particularly relevant in situations where the normal braking system is insufficient for the weight of the vehicle or load. By utilizing the additional air pressure from the separate tank, the driver can engage the brakes more powerfully, ensuring better control and safety when bringing the vehicle to a stop or holding it in position.

The separate tank's air pressure plays a crucial role in enhancing brake performance, especially when maneuvering heavy loads or during inclines. This system allows for a more responsive and effective braking action, which is essential for maintaining safety on the road.

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Start the engine

Increase tire pressure

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