This little guy really has one main job – it periodically releases the built – up air pressure in your air dryer system. It’s basically a valve that cycles open and closed. This purging action gets rid of water and oil that have accumulated in the system. It also helps maintain consistent air pressure. Some have a small filter as part of it too, just to catch some extra debris. It’s a key component of your air brake system, mostly found on larger vehicles like trucks, buses, and sometimes even RVs. The air compressor makes the air, but it also creates moisture. That moisture has to get removed because water and air brakes don’t mix well – it can cause corrosion, freezing in the winter, and just general system failure. The air dryer does the bulk of that work, and this unloader helps it do its job efficiently. It’s positioned right after the air dryer itself. Look, air brakes are critical for stopping these bigger vehicles. If moisture gets into the lines, it can cause brake fade, meaning you’ll need more and more pressure to get the same stopping power. That’s obviously dangerous. The unloader prevents that buildup, keeping the air dry and the brakes responsive. You’ll notice if this part starts to fail, usually with longer brake engagement times or inconsistent air pressure readings on your gauge. It acts like a shield against corrosion and keeps everything running smoothly. If you're doing any brake work, it’s a good idea to check this part. You can find these pretty easily—we stock them at Fixparts Online, or most auto parts stores should have one. We stand behind our products: Single Chamber Air Dryer Unloader (MPN 9324000170) has 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. Performance you can rely on – Wabco parts from FixParts Online.