This valve basically has four jobs. First, it regulates the air pressure going to your spring brakes – those emergency brakes that kick in if you lose air pressure. Second, it protects those spring brakes from being overcharged with air, which could cause them to drag. Third, it releases the spring brakes when you need to drive normally. And finally, it acts like a shield, preventing air from leaking from the spring brake chambers back into the main brake system. It's a lot packed into one valve, honestly. Think of it as the safety net for your entire air brake system. It sits between your air compressor and the spring brakes. Everything’s connected, so the valve ensures those emergency brakes work when you need them, but don’t interfere when you don’t. It's a crucial part of the safety system, especially for bigger vehicles like trucks and buses. If this valve fails, you could have a lot of problems. You’ll notice if your spring brakes are slow to release, or if they drag while you’re driving, causing overheating and wear. Worse, you might not be able to engage those emergency brakes when you actually need them—that’s a serious safety issue. It's the kind of part you really don’t want to mess around with. You can find these at places like Fixparts Online, and honestly, regular inspections are a good idea. It’s a relatively inexpensive part considering the trouble it can save you. Technical support you can rely on: Quadruple Protection Valve (MPN 9347141450) 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 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. Wabco – trusted quality, available at FixParts Online!