If your truck or bus has dual parking control valves, what can you use pressure from a separate tank for?

When a truck or bus is equipped with dual parking control valves, it allows operators to engage various functions using compressed air from a separate tank. One critical use of this separate tank is to release the spring emergency or parking brakes temporarily, enabling the vehicle to move a short distance. This is particularly useful for positioning when parking or maneuvering in tight spaces.

Additionally, having a separate air tank can also be advantageous if the main tank pressure is dropping. The pressure from the auxiliary tank can be utilized to apply additional braking pressure, ensuring that the vehicle remains safe and operable even under lower main tank pressure conditions.

Furthermore, maintaining balanced brake pressure in the service brake system while parked can be critical for safety. The separate pressure source can help ensure that the brake system maintains appropriate functionality when stationary.

Therefore, the ability to leverage pressure from a separate tank encompasses all these functionalities, illustrating the versatility and importance of having dual parking control valves in a trucking or bus system.