This Cup Seal, manufactured by Wabco with MPN 8971809002, is a critical component within air brake relay valves. It's designed for use in braking systems to maintain pressure and ensure reliable operation. This cup seal meets OE specification, delivering a precise fit and optimal performance for repair kits. Its dimensions are 12 x 62 x 64 mm, contributing to its effective sealing capabilities and durability within the air brake system. This little rubber piece—it’s basically a seal, as the name says—creates a tight fit inside the relay valve. It prevents air from leaking where it shouldn’t, and it helps maintain the air pressure needed to apply your brakes. It’s a simple component, but it’s crucial for the system to work correctly. It flexes and moves with the valve as it operates, sealing off different chambers at different times. Think of your air brake system like a chain. The relay valve is one of the links, and this cup seal is what keeps that link solid. The relay valve itself takes the signal from your brake pedal and boosts it to apply the brakes at the wheels. The cup seal ensures that boost happens powerfully and consistently. It’s part of what allows the system to respond quickly when you hit the pedal. If this cup seal fails, you'll start to lose air pressure. You'll notice if your brakes feel spongy, or if it takes longer to stop. It could even lead to a complete brake failure, which obviously, is serious. It’s a wear item, meaning it will eventually degrade and fail from the constant flexing and exposure to air and contaminants. Replacing it proactively is much better than waiting for a problem. They’re relatively inexpensive, and a lot easier to deal with than major brake repairs. You can find these pretty readily, we carry them here and Fixparts Online is a good source if you prefer to order that way. It's one of those parts where a little maintenance can save you a lot of trouble down the road. Competitive edge: Cup Seal (MPN 8971809002) includes a 12-month warranty!

About Wabco

WABCO specializes in air braking systems, EBS, ABS, ADAS, and trailer control systems.

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. Drive with confidence – choose Wabco parts at FixParts Online.