Wabco 4721950340 Relay Valve

Description

The Wabco 4721950340 Relay Valve is a critical component within air brake systems, specifically designed for trailer brake control. It regulates air pressure to the trailer brakes, ensuring efficient and reliable stopping power. This device features dimensions of 144 x 106 x 109 mm and is engineered to meet OE specifications, offering enhanced durability and performance. With a robust design boasting an IP 66 / IP 69K protection class and operating within a temperature range of -40°C to +80°C, this relay valve delivers consistent and dependable operation in challenging conditions. Its electrical connection is Bayonet DIN 72585 A1-3.1-Sn/K1 and operates at 12 V with a rated current of 2220 mA.

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 4721950340) comes with a 1-year warranty.