Wabco 9253940020 Double Diaphragm Tristop 30/36

Description

The Wabco 9253940020 Double Diaphragm Tristop 30/36 is a critical component within air brake systems, functioning as a brake actuator to convert air pressure into mechanical force. This actuator is designed for use in heavy-duty vehicles and trailers, ensuring reliable and efficient braking performance. Its double-diaphragm design enhances responsiveness and provides a consistent braking force. Measuring 240 x 240 x 470 mm, this 30/36 type actuator features a cam-based operation, 75.9 mm stroke and is engineered to OE specification for optimal compatibility and performance. It operates effectively within a temperature range of -40°C to +80°C and supports a maximum operating pressure of 10.0 bar, providing a robust and dependable solution for air brake systems.

Key Features & Benefits

This thing basically takes the compressed air from your system and converts it into mechanical force to apply your trailer brakes. It's a bit more sophisticated than a simple air cylinder, though. The ‘double diaphragm’ part means it has two flexible membranes working together, which gives you more power and a smoother, more reliable brake application. The ‘Tristop’ part refers to a feature that mechanically locks the brakes in position if air pressure is lost – it’s a fail – safe. It also features spring apply, air release functionality. It sits right in your air brake system, usually mounted to the trailer. You'll find it connected to the air lines coming from your tractor’s air system, and then linking to the trailer's brake chambers. Think of it like the muscle that actually squeezes the trailer brakes when you hit the pedal. It’s what translates the air signal into stopping power for your trailer. It's a critical part of the entire system; it doesn’t just help apply the brakes, it is the actuator doing the work.

Symptoms, Risks & Replacements

Honestly, this is one of those parts you really don't want to mess around with. It’s a key safety component. If it fails, you could lose braking power on your trailer – obviously, a really dangerous situation. The Tristop function, that locking mechanism, is designed to prevent runaway trailers in case of air line failure. It’s kind of like a shield protecting you from a complete brake failure. You’ll notice if this thing is going bad – things like slow brake response, needing to apply more air pressure to get the same stopping power, or even the trailer brakes dragging. You can find these online pretty easily, Fixparts Online has a good selection, and replacing it proactively is a lot cheaper and safer than dealing with a breakdown on the road.

Warranty Information

Wabco Double Diaphragm Tristop 30/36 (MPN 9253940020) comes with a 1-year warranty.