This is a Wabco relay valve, a critical component within air brake systems. It's designed to control the flow of compressed air to the brakes, ensuring reliable and responsive braking performance in commercial vehicles. This relay valve is an OE specification component with dimensions of 29 x 30 x 47 mm. Its precise engineering ensures consistent operation, enhances safety, and contributes to the overall efficiency of the braking system. This little insert actually does a pretty important job inside the relay valve. It’s basically a valve within a valve – it controls the flow of compressed air, allowing air into and out of the brake chambers. It opens and closes based on the signal from your foot pedal and the existing air pressure in the system. It's also got a filter built in, so it keeps debris from messing with the valve itself. Think of the relay valve as the middleman between your brake pedal and the actual brakes at the wheels. The insert is a key part inside that relay valve. It takes the relatively low – pressure signal from the cab and boosts it to the higher pressure needed to operate the brake chambers. It's involved in applying and releasing the brakes. It allows the system to respond quickly and consistently to your braking actions. Well, without a good insert, your brakes won't work reliably. A failing or damaged insert can cause slow response, uneven braking – maybe one wheel doesn't get full pressure – or even a complete loss of braking power on a wheel or axle. It acts like a shield, protecting the main valve from dirt and moisture, and if it fails, that protection goes away. You’ll notice if this thing goes bad, usually as a slow brake response, or having to press the pedal further than usual. You can sometimes feel it as a pulsing or hesitation. You can find these inserts pretty easily, actually, I've seen them at Fixparts Online and other auto parts suppliers. It's a relatively inexpensive part, but crucial for safety, so it's good you’re looking at it. Long-term solution: Insert (MPN 4710055004) is backed by a 12-month warranty!

About Wabco

WABCO is a global innovator in braking, stability, and suspension systems for commercial vehicles, enhancing safety and efficiency.

Why Choose Wabco?

• Wabco parts are known for lasting a long time, saving you money on repairs in the long run. • We have a huge selection of parts, so you’re likely to find exactly what you need for your vehicle. • Our parts meet or exceed industry standards, giving you peace of mind on the road. • Wabco has been a trusted name in auto parts for decades, with a reputation for quality and reliability. Performance you can rely on – Wabco parts from FixParts Online.