There are many parts of a PARKING RELEASE VALVE. Here is a quick overview: Function, Construction, Chamber inserts, and Operation. Hopefully, this information will help you make the right choice. For more information, read our article below. It will answer many of your questions! Have you ever wondered what a PARKING RELEASE VALVE is? You may be surprised to learn that this simple device is responsible for protecting your car from a lot of potential problems!

Function
When the driver pushes a button on a dash-mounted parking brake control valve, the brakes are released from a sprung-loaded state. Depending on the vehicle model, these parking brakes may drag or apply fully if the air pressure is below 70 psi. Other vehicles may have a one-way valve that allows air to flow in one direction but blocks it in the other.

This type of parking brake valve has two ports: an inlet and an outlet. The inlet port allows air under pressure to enter. The outlet port allows air to flow from the inlet to the outlets. This type of valve also serves as a spring-brake chamber. The parking brake valve is located on the front end of the vehicle. The parking brake release valve controls air pressure when the parking brake is applied. It can also be used as an emergency brake valve.

Construction
The construction of the parking release valve comprises a chamber insert (50) mounted in a central recess (54). A second through hole (62), forming the second chamber, is located on the outside of the valve housing body. Both inserts are attached to the valve body by a piston. The valve element (14) moves from the release position (V3) to the travel position (V2) by means of a spool.

The construction of the parking release valve may comprise first and second lip seals that form an integral part of the spool. These lip seals preferably seal the chamber insert and the valve spool. The spool may also include a chamber insert. The spool is then secured to the valve housing. The parking release valve is complete when it releases the pressure from the gas reservoir. The release valve can be used to open and close the car.

Chamber inserts
Parking release valves are equipped with a spring-loaded brake actuator that needs to be pressed to apply the brakes. When air pressure reaches around 20 psi or lower, the parking brakes will drag a bit until the pressure reaches 70 psi, and they will fully apply if the pressure lands between 20 and 45 ppsi. Many vehicles have these kinds of parking brake actuators, but some of them never close. The spring brakes need to fully apply before the air pressure reaches 70 psi, so these valves will not close fully until the air pressure in the parking release chamber dries up completely. The same applies to similar spring-loaded valves, such as the ones in parking brake calipers.

When installed in the parking release valve, the inserts allow the actuator to push the spring toward the rear of the housing instead of the center. This relieves the high pressure in the power spring chamber, which allows clean air to enter the parking brake release chamber. The spring is still holding the parking brake release piston in place. In this condition, the spring does not work properly and the piston may be prone to jamming.

Operation
The parking brake control valve is located on the dash of the vehicle. It is designed to control the amount of air pressure supplied to the parking brakes. Many parking brakes are spring-loaded, meaning that they apply pressure only when air is supplied. When air pressure exceeds the force of the spring, the brakes will be released. This is known as a "pop" in the industry. In some cases, this valve will never close.

The Park Release Valve is an integral part of the new generation Trailer EBS platform. This valve is designed with a one-button design to enable manual release of the spring brake. This feature enables the user to set the system park valve as per their preference. The valve must be installed with sufficient reservoir pressure. The actuator lock ports or auxiliary diaphragms are designed to apply air pressure to the valve.

Problems
If you notice that your parking release valve is not working properly, you can change it. It should only take you about an hour. It may sound like a daunting task, but it really isn't. Here are some things to remember when replacing this valve:

Replacement
The parking release valve controls the trailer's spring brakes and releases the tractor's spring brakes when the vehicle stops. A blue round knob controls the release of the brakes. The valve responds when air pressure in the brake system falls below a certain level. It pops out to exhaust the remaining air holding the spring brakes in a released position. This sudden air exhaust can cause the vehicle to stop uncontrollably.

Ensure the shunt valve is in the operating position before installing the parking release valve. The parking valve must be installed with air pressure of at least 5.0 bars in the supply reservoir and 0 bar in the port 12/2 spring brake system. Replace the valve according to the statutory regulations of the SS 29 StVZO and the legal requirements of your registering country. If the valve fails, check that the cage filter is in good condition and does not contain paint penetration.