This piston is a critical component within Wabco air brake systems, specifically utilized in relay valves to facilitate the efficient and reliable operation of braking mechanisms. It functions by converting pressure into mechanical motion, enabling the application and release of brakes in commercial vehicles and heavy machinery. This piston is manufactured to OE specification, ensuring a precise fit and consistent performance. Measuring 21 x 89 x 89 mm, this component delivers enhanced durability and responsiveness, contributing to increased safety and reduced maintenance costs. This little guy basically takes the air pressure coming from your system and translates it into mechanical movement. It slides back and forth inside the valve body, opening and closing ports. Think of it like a gatekeeper controlling the flow of air to your brake chambers. It’s what actually does the work of applying and releasing the brakes when you hit the pedal or the automatic systems kick in. It handles the pressure, and that movement is what tells the brakes what to do. It’s a critical component of your air brake system, naturally. The relay valve itself is what amplifies the signal from your brake pedal or automatic controls to the brake chambers at each wheel. The piston inside the relay valve is the part that makes that amplification happen. Without it functioning correctly, the signal gets lost, and your brakes won’t respond reliably. It lives inside the relay valve, so it’s not something you’ll see directly when inspecting the whole brake system. It’s important because, well, brakes are important, right? A worn or damaged piston means inconsistent braking. You'll notice if it's bad—you might get longer stopping distances, or feel a spongy brake pedal. It acts like a shield, protecting the valve body itself from wear, but it is a wear item. Over time, the seals can degrade, or the piston can get scored. If it fails completely, you could lose braking power on that axle. You can find these pistons at places like Fixparts Online, and it's something you want to address quickly if you suspect it's failing, because it directly impacts safety. Safe driving starts here: Piston (MPN 9730116284) has 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, so you won't have to replace them as often. • We have a huge selection of parts, covering many different makes and models of vehicles. • Our parts are made to meet or beat the quality of original equipment, without the high price tag. • Wabco has been a trusted name in auto parts for years, with a reputation for reliability and performance. Wabco – trusted quality, available at FixParts Online!