Wabco 4721950250 Relay Valve

Description

The Wabco 4721950250 Relay Valve is a critical component in air brake systems, specifically designed for trailer brake controls. It regulates air pressure to the trailer brakes, ensuring reliable and responsive braking performance. This device features M22 x 1.5 and M16 x 1.5 port threads, along with an M24x1 electrical connection, and is suitable for use with connector 8946010182. Its robust construction, with dimensions of 115 x 108 x 100 mm, and IP 68 protection class, ensure durability and resistance to harsh environments. Operating at 24V and up to 10.0 bar of pressure, this relay valve delivers precise control and consistent performance across a temperature range of -40°C to +80°C, meeting OE specifications for optimal compatibility and reliability.

Key Features & Benefits

This thing basically controls the air pressure going to the spring brakes on your trailer. It has a couple of jobs. It’s the main control for applying and releasing those spring brakes, and it also manages the emergency line – meaning if the connection between your truck and trailer gets broken, it’ll automatically apply those trailer brakes. It's like a gatekeeper for the air that operates your trailer brakes. Think of your tractor’s brake system as sending a signal to the trailer. The relay valve is the part that receives that signal and translates it into actual braking force on the trailer. It doesn’t directly control the truck brakes, it’s all about what’s happening back on the trailer axles. It’s a key piece of the whole air brake puzzle – without it, your trailer’s brakes just won't work properly.

Symptoms, Risks & Replacements

This is a safety thing, plain and simple. If it fails, your trailer brakes might not apply when you want them to, or they might drag. You’ll notice if it's failing because you might feel pulling or a longer stopping distance, or the trailer brakes might stick and overheat. It acts like a shield, protecting you from a runaway trailer situation. If you suspect a problem, get it checked immediately. You can find these parts pretty easily – a place like Fixparts Online has a good selection if you want to take a look. But honestly, if you're not comfortable working on air brakes, let a professional handle it. It's not something to mess around with.

Warranty Information

Wabco Relay Valve (MPN 4721950250) comes with a 1-year warranty.