Wabco 4721950370 ABS Relay Valve

Description

The Wabco 4721950370 ABS Relay Valve is a critical component within trailer air brake systems, specifically designed for trailer brake controls. It regulates air pressure to the trailer brakes, ensuring optimal braking performance and stability. This device features a robust design with a size of 109 x 108 x 126 mm, and utilizes M22 x 1.5, M16 x 1.5 and snap-on contour port threads. It operates within a temperature range of -40°C to +80°C, with a rated current of 1650 mA at 24 V and a maximum operating pressure of 10.0 bar, while adhering to OE specifications. The ABS Relay Valve’s IP 66 / IP 69K protection class ensures durability and reliability in harsh operating conditions, contributing to enhanced safety and extended service life.

Key Features & Benefits

This valve basically manages the air pressure going to each brake on the trailer. It rapidly cycles the air on and off—that’s how it prevents wheel lockup during braking. It doesn't control the brakes themselves, it modulates the air to the brakes. It receives signals from the ABS control module, telling it when to release and apply pressure to each wheel individually. It’s a pretty intricate little piece, handling a lot of quick adjustments. It’s a key component of your trailer’s anti – lock braking system – ABS. If you have electric brakes, you'll also have an ABS module, and this valve sits between that module and the brake chambers. The ABS module reads wheel speed sensors, and tells this valve to reduce air pressure to a wheel if it senses it's slowing down too quickly, preventing a skid. It lets you maintain steering control during heavy braking, and helps shorten stopping distances.

Symptoms, Risks & Replacements

Well, without it, your trailer’s ABS system won’t work properly. That means you could lose steering control in a panic stop or on a slippery surface. It acts like a shield against skidding, letting you keep the trailer tracking behind you. You’ll notice if this valve fails—typically you’ll get an ABS warning light on your dash, and the trailer might pull to one side during braking, or even lock up. We stock these at Fixparts Online, and getting a good one replaced promptly is really important for safety. It's a relatively small part, but it makes a huge difference when you really need to stop.

Warranty Information

Wabco ABS Relay Valve (MPN 4721950370) comes with a 1-year warranty.