Wabco 4750090120 Pressure Limiting Valve

Description

The Wabco 4750090120 is a Pressure Limiting Valve designed for air brake systems. This valve is a critical component in maintaining safe and reliable braking performance in commercial vehicles and trailers. It regulates air pressure within the system, preventing over-pressure situations that could damage components or compromise braking effectiveness. This device features M12 x 1.5 port threads, a nominal diameter of 4.0 mm, and operates effectively within a temperature range of -40°C to +80°C. Its dimensions are 83 x 70 x 67 mm, and it is built to OE specification for optimal compatibility and performance.

Key Features & Benefits

This valve basically controls the maximum air pressure that goes into your brake system. It takes the higher pressure from your air compressor and reduces it to a safe level for the rest of your components – things like your air bags, actuators, and brake chambers. It’s a pretty simple idea, but really important for keeping everything working correctly. It doesn't make pressure, it just manages it, stepping it down to what the system needs. Think of it as a gatekeeper for your air brake system. It sits between the air compressor and the rest of the braking components. It ensures no single part is over – pressurized. It’s commonly found on trucks and trailers, anything that relies on air brakes to stop safely. Different vehicles might have it located in slightly different spots, usually somewhere along the air lines near the compressor or the first major components.

Symptoms, Risks & Replacements

Well, if this valve fails, you could have too much pressure going to parts that aren’t designed for it. That’s a recipe for blown seals, damaged actuators, or even complete brake failure. It acts like a shield, protecting the more sensitive parts of your air system. You’ll notice if it's failing – things like brakes dragging, unusually long stopping distances, or the air compressor running constantly. It's a relatively inexpensive part considering what it protects, and it's one of those things it's best to replace proactively if you suspect trouble. Fixparts Online has a good selection of these if you're looking for a replacement, and they often have diagrams that help you find the correct one for your vehicle.

Warranty Information

Wabco Pressure Limiting Valve (MPN 4750090120) comes with a 1-year warranty.