The Wabco PRO7127120 Double-Diaphragm Tristop Disc is a critical component within air brake systems, functioning as a brake actuator. It's designed for use in heavy-duty vehicles and trailers where reliable and efficient braking performance is essential. This device utilizes a double diaphragm design to provide consistent and powerful actuation, improving responsiveness and safety. The disc measures 190 x 205 x 320 mm and features M16 x 1.5 bolt threads, a 235 mm push-rod with a Ball R8 thread, and operates within a temperature range of -40°C to +80°C. Its robust construction and precise engineering contribute to extended service life and reduced maintenance requirements. This disc basically controls the airflow in your air brake system's actuator. It’s a key part of how the brakes apply and release. It has two diaphragms, and that’s what gives it extra power and responsiveness. The "Tristop" part means it has three distinct positions – applying the brakes, releasing them, and a holding position – giving you a lot more control. It's all about managing the air pressure and translating that into stopping power. This lives inside the brake actuator, which is the part that actually pushes or pulls to engage the brakes on your trailer or heavy – duty vehicle. Think of it as the core of the braking mechanism. When you hit the brakes in the cab, that sends air pressure to the actuator, and this disc is what moves inside to control that pressure and ultimately apply the brakes. It's responsible for quickly and reliably converting air pressure into mechanical force. Well, if this disc fails, you lose braking power, plain and simple. It’s a safety – critical component. A failing one can cause slow response times, inconsistent braking, or even complete brake failure. It acts like a shield, protecting the rest of the system from over – pressure, and ensuring smooth, controlled stops. You’ll notice if it's failing because you might get spongy brakes, or it could take much longer to come to a stop. It's something you definitely want to keep in good working order. You can find these readily available online, and places like Fixparts Online have a good selection. It’s a relatively inexpensive part to replace, compared to the cost of dealing with brake problems down the road. Your satisfaction is our mission: Double Diaphragm Tristop Disc (MPN PRO7127120) includes 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, 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. Drive with confidence – choose Wabco parts at FixParts Online.