Wabco 9253920460 Double Diaphragm Tristop 30/30

Description

The Wabco 9253920460 Double Diaphragm Tristop 30/30 is a critical component within air brake systems, functioning as a brake actuator to convert air pressure into mechanical force for effective braking. It is typically used in heavy-duty vehicles and trailers. This 30/30 actuator features a cam-operated design and is built to OE specification, ensuring reliable performance and compatibility. Key dimensions include a total length of 340.0 mm, a stroke of 64.0 mm, a push-rod length of 146.0 mm with a 5/8 - 18 UNF thread, and a distance between bolts of 120.6 mm using 5/8 - 11 UNC bolts. It operates efficiently within a temperature range of -40°C to +80°C, with a maximum operating pressure of 10.0 bar and a release pressure of 4.6 bar. The actuator features 3/8 - 18 NPTF port threads and a 90° port angle, and is supplied without a boot or yoke.

Key Features & Benefits

This part is basically the heart of your spring brake actuator. It takes air pressure and translates that into mechanical force to release your spring brakes. The “double diaphragm” design means it has two flexible membranes working together – that gives you a stronger, more consistent push. The “Tristop 30/30” part refers to how much force it generates – 30 square inches of area with a 30 psi air supply. It’s got three distinct stages of release, offering really precise control. Think of your spring brakes as always on – they’re a safety feature. This actuator is what pushes against those springs to let your wheels roll freely when you want to move. It's part of the air brake system, so it’s most common on heavier vehicles – trucks, buses, trailers, that sort of thing. When you press the brake pedal, the air system sends pressure to this diaphragm, which then pushes the brakes off. When air pressure drops, like when the engine’s off, the springs automatically apply the brakes.

Symptoms, Risks & Replacements

It's a critical safety component. If this diaphragm fails, your brakes could stay engaged, or worse, not release properly. You’ll notice if it's going bad – things like dragging brakes, longer stopping distances, or even the vehicle not moving when you hit the release. It acts like a shield against the constant tension of those spring brakes, and it needs to be reliable. You can find these, and a lot of other air brake parts, over at Fixparts Online if you're looking. It’s something you really don’t want to mess around with, so it's best to replace it if you suspect an issue.

Warranty Information

Wabco Double Diaphragm Tristop 30/30 (MPN 9253920460) comes with a 1-year warranty.