This cap is a component used within the Air Processing Unit of Air Brake Systems. It is manufactured by Wabco under MPN 4801030404. This cap is designed to meet OE specifications, ensuring reliable performance and compatibility within the air brake system. Its dimensions are 20 x 20 x 29 mm, contributing to its precise fit and function. This cap seals off the air processing unit itself. That unit does a few really important things – it filters the air going into your braking system, regulates the air pressure, and removes moisture. The cap is simply the final seal, keeping all that clean, dry air inside where it needs to be and keeping dirt and water out. It's a surprisingly simple part, but crucial. Think of the air processing unit as the heart of your air brake system. It’s providing the air that actually stops the vehicle. This cap is the final layer of protection for that heart, preventing contamination. It keeps everything working smoothly and consistently. It's typically located right on top of the unit, so it's fairly exposed to the elements. If this cap fails, or cracks, you'll start getting unfiltered air and moisture into the system. That can lead to corrosion, and eventually, brake failure. You’ll notice if it’s leaking – likely from visible moisture around the unit, or a drop in air pressure if you're checking your gauges. It’s a small, inexpensive part to replace, and honestly, doing it proactively is way cheaper and safer than dealing with a brake issue. We’ve got a good selection of these at Fixparts Online, and it’s one of those things that’s pretty straightforward for a DIYer to swap out. Drivers trust Wabco: Cap (MPN 4801030404) comes with 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 delivers excellence, FixParts Online delivers to your door.