This cap is a component used within trailer brake controls in air brake systems. Specifically, it's designed for use with Wabco systems. This cap meets OE specification, ensuring reliable performance and durability. Measuring 27 x 22 x 21 mm, it provides a precise fit and contributes to the overall efficiency of the braking system. This cap essentially seals off one of the ports on your air control valve. It prevents dirt, moisture, and anything else from getting inside the valve itself. It also maintains the air pressure where it needs to be. Think of it like a really important lid on a container. It’s part of the air brake system, which, as you probably know, is what stops the vehicle. Specifically, this cap is on the air control valve which manages the air flow to the brakes. Without proper sealing, the whole system can malfunction. It’s a small component, but everything is connected. It’s important because if this cap fails – if it cracks, gets damaged, or simply doesn't seal right – you’re going to lose air pressure. You’ll notice if your brakes start feeling spongy, or if your parking brake doesn’t hold like it should. It’s a safety thing, plain and simple. A small leak can cause big problems down the road. We carry these frequently, and you can find a good selection at places like Fixparts Online, but getting the right one is crucial. It’s always best to replace these when you're doing other work on the air system, just as preventative maintenance. Dedicated to your needs: Cap (MPN 4757110414) comes with 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 built to last, meaning fewer repairs and more time on the road. • We offer a wide range of parts for many different vehicles – chances are we have what you need. • Our parts meet or exceed industry standards, giving you reliable performance you can trust. • Wabco has a long history of serving professionals and DIYers alike with quality auto parts and excellent customer support. Drive with confidence – choose Wabco parts at FixParts Online.