Park Release Emergency Valve

Park and Release Valve — Heavy Commercial Vehicle Brake System Components

The park and release valve is a crucial component of the Brake System in trucks and buses, engaging the parking brake, releasing it when needed, and rapidly venting air from the system in emergencies as a control element. Pulled from the driver's cabin, it locks the parking brake; when pushed, it releases the brake and allows the vehicle to move; it can also independently engage the brakes of trailers or towed vehicles in emergency situations. By precisely managing pressure variations in the air circuit, it enables both safe parking and emergency intervention. Repeated use under heavy loads and on long-distance routes makes the valve's durable and consistent operation particularly critical.

The product range includes complete valve bodies, internal mechanism repair kits, seals, springs, and mounting sets. In-cabin control types, pull-push mechanism variants, and electronically assisted options are available depending on different vehicle architectures. Robust housing materials and precise sealing components deliver long-lasting and reliable performance. Options suited to different cabin layouts and brake circuit designs can be selected according to the needs of fleet operators and service centers.

• Complete park and release valve assemblies
• Internal seal and spring repair kits
• Control lever and connection accessories
• Mounting and sealing materials

Among options prepared with general compatibility to major truck and bus manufacturers in mind, it is important to select the model suitable for your vehicle's cabin layout and brake circuit design. For the correct choice, the existing valve's connection arrangement and control mechanism should be used as reference, and worn seals and springs should be replaced in a timely manner. Regular inspection prevents air leaks and slack parking brake operation, enhancing driving safety.

Frequently Asked Questions

Where is the park and release valve located in the vehicle? Typically located in the driver's cabin in an easily accessible position, connected to the air brake circuit.

What happens when the valve malfunctions? The parking brake may not lock completely or may not release properly, adversely affecting both parking safety and vehicle movement.

What should be done if an air leak is detected? The valve body and connection points should be inspected, and worn seals or springs should be replaced without delay.

How does this valve relate to other components in the Brake System? It works in conjunction with components such as the adjustment device, air tank, ABS, and Dual ABS Relay Valve to maintain the integrity of the brake circuit; a malfunction in any one can affect the performance of the others.

How often does replacement become necessary? While the interval depends on usage intensity and climate conditions, it is recommended that the valve be checked during periodic maintenance.

Are compatible aftermarket alternatives available to match the original product? Yes, a wide range of complete valve and repair kit options manufactured to OE-equivalent quality are available.

What should be observed during installation? The sealing of connection points and free movement of the control mechanism should be tested; improper installation can lead to air leaks.