This Cylindrical Compression Spring is a critical component within air brake systems, specifically used in relay valves. Manufactured by Wabco with MPN 8965123604, this spring provides the necessary force for proper valve operation, ensuring reliable braking performance. Its dimensions are 36 x 24 x 158 mm. This spring is manufactured to OE specification, providing a direct replacement for original equipment and maintaining optimal system functionality and durability. This spring basically stores energy when something presses on it, and then releases that energy to do a job. In this case, it's controlling the flow of air in your brake system. It pushes against another part inside the relay valve – think of it like holding a door closed. When enough air pressure hits it, it compresses, allowing air to move through and activate your brakes. It then rebounds when the pressure eases up, cutting off the airflow. It’s a pretty simple mechanism, really, but super important. It lives inside the air brake relay valve, which is a key part of how your air brakes work. The relay valve takes the signal from your brake pedal and amplifies it, sending a stronger signal to the brake chambers on the wheels. This spring is a vital piece of that amplification process. It’s ensuring the valve opens and closes properly, every time you hit the brakes. Well, without a good spring, that valve won’t operate correctly. You might get slow braking, inconsistent braking, or even the brakes dragging. It acts like a shield, protecting the valve from sticking or malfunctioning. You’ll notice if this thing goes bad – the brakes won’t feel right, responsiveness will suffer, and it can become a safety issue. It's a relatively inexpensive part to replace, and doing it proactively can save you a lot of headaches down the road. You can find these pretty easily, we stock them here of course, and sites like Fixparts Online are good resources too if you’re looking around. It’s one of those things that, when it’s good, you don’t even think about it, but when it goes bad, you definitely know. Premium parts, premium warranty: Cylindrical Compression Spring (MPN 8965123604) is covered for 12 months!

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, covering many different makes and models of vehicles. • Our parts are made to meet or beat the quality of original equipment, so you can trust their performance. • Wabco offers great customer support to help you find the right parts and answer any questions you may have. Performance you can rely on – Wabco parts from FixParts Online.