Wabco 4700155907 Trailer Control Valve

Description

The Wabco 4700155907 Trailer Control Valve is a critical component within a commercial vehicle's air brake system, specifically managing the trailer brakes. It's designed for use in heavy-duty trucks and trailers to ensure safe and reliable braking performance. This valve features a 1-circuit design, delivering a consistent 45.0 bar of pressure with a maximum operating pressure of 7.0/50.0 bar, and is constructed to OE specification. Its dimensions are 124 x 134 x 195 mm, with mounting via 2x Ø9.0 mm bolts and port threads of M16 x 1.5 (two ports) and DIN 74235 - EL M12 x 1. The calculated volume is 3.24, and the distance between bolts is 48 mm, with a hole distance of 56.5 mm. This valve operates effectively within a temperature range of -40°C to +80°C, offering robust and dependable performance in varied conditions.

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 4700155907) comes with a 1-year warranty.