Driving position: When the control handle is in the initial position, the foot brake valve does not work and the vehicle can operate normally. This position is the basis for the operation of the handle, ensuring the free movement of the vehicle during normal driving.
Parking position: By moving the control handle, when the handle crosses the thrust point and reaches the parking brake lock position, the entire vehicle enters the parking brake state. This is achieved by locking the handle, ensuring the stability of the vehicle when parked.
Inspection position: The design handle is in a locked state when in the inspection position, which allows for the detection of the trailer's parking brake. At the inspection position, if there is a slip, the trailer parking lever needs to be closed separately or a suitable parking position needs to be selected. Once the joystick is released, it automatically returns to the parking brake position, ensuring both safety checks and ease of operation.
The design of WABCO foot brake valve not only considers the conventional braking requirements of the vehicle, but also specifically considers the braking measures in emergency situations. For example, when other braking circuits of the vehicle fail, emergency braking can be achieved by moving the handle between position 1 and position 2, which further enhances its safety and reliability.
In summary, the WABCO foot brake valve provides a stable and reliable braking solution for commercial vehicles through its carefully designed working position and function, ensuring safety during driving and parking.