Wabco 4802040020 Trailer Control Valve

Description

The Wabco 4802040020 Trailer Control Valve is a critical component in air brake systems, specifically designed for trailer brake control. This valve regulates air pressure to the trailer brakes, ensuring safe and efficient stopping performance. It's commonly used in heavy-duty trucks and trailers to coordinate braking between the tractor and trailer. This device operates with a delivered pressure of 8.5 bar and a maximum operating pressure of 8.5 bar, featuring electrical connections via Bayonet DIN 72585 and mounting via 3x M8 bolts. Its robust design, with protection class IP 6K6K / IP 6K9K, and operating temperature range of -40°C to +80°C, ensures reliable operation in demanding conditions. The valve's dimensions are 182 x 169 x 176 mm.

Key Features & Benefits

This valve basically manages the air pressure going to the trailer’s brakes. It takes the signal from your foot pedal – when you push on the brake inside your truck – and translates that into the right amount of air pressure sent to the trailer’s brake chambers. It controls how hard the trailer brakes apply, and it also lets you manually apply just the trailer brakes separately, which is handy for testing or maintenance. It also has a spring emergency function, so if you lose air pressure in the system, it’ll automatically apply the trailer brakes to prevent a runaway situation. Think of it as the middleman between your truck's braking system and the trailer's. Your truck applies the brakes, but this valve decides how much of that braking force gets sent back to the trailer. It’s a key piece in ensuring balanced and controlled stopping, especially with heavier loads. It's usually found somewhere along the air line running from the truck to the trailer, often near the gladhand connection.

Symptoms, Risks & Replacements

It’s incredibly important for safety. If this valve fails, you could have several problems. You might not get enough braking force to stop safely, or the trailer brakes might lock up. You’ll notice if it's failing because the trailer might feel like it's pushing you around during braking, or the brake feel generally won’t be right. It acts like a shield, protecting you from a potentially dangerous situation. It's one of those parts where it’s definitely worth keeping in good working order. You can find a replacement easily enough, somewhere like Fixparts Online has a pretty good selection, and it's a straightforward replacement for a mechanic.

Warranty Information

Wabco Trailer Control Valve (MPN 4802040020) comes with a 1-year warranty.