Wabco 4756040430 Load Sensing Valve

Description

The Wabco 475604030 Load Sensing Valve is a critical component within air brake systems, primarily used in commercial vehicles like trucks and trailers. This manual valve regulates the air pressure to the brakes based on the vehicle’s load, ensuring optimal braking performance and stability. It mounts via a Flange DIN 71501 connection and features M22 x 1.5 port threads. The valve operates dynamically and covers a range of adjustment from 1.4 to 2.8 / 3.4 to 4.3 bar, with a maximum operating pressure of 10.0 bar. Its robust mechanical design, coupled with OE specification adherence, provides reliable and consistent performance across a wide temperature range of -40°C to +80°C. Dimensions are 130 x 150 x 95 mm.

Key Features & Benefits

This valve basically monitors how much weight your vehicle is carrying, and then adjusts the air pressure going to the rear brakes accordingly. It’s a pretty smart little piece. It does this by physically sensing the movement of your suspension – how much it's compressing under load. That movement tells the valve how heavy the load is. It then proportionally increases or decreases the air pressure sent to the rear air springs and brakes. Think of it as the brain controlling the rear brakes, making sure they’re working with the weight you’re hauling. Without it, your rear brakes might not be strong enough when you’re loaded, or they might lock up easily when you're empty or lightly loaded. It's a key part of keeping everything balanced and safe, especially on trucks, trailers, and heavier vehicles that use air brakes.

Symptoms, Risks & Replacements

It’s vital for safe stopping. If you're carrying a full load and this valve fails, you might have seriously reduced braking power in the rear – a really dangerous situation. Conversely, if it fails and over applies pressure to the rear brakes when unloaded, you’ll notice if you’re getting a lot of rear – wheel lockup. It’s designed to prevent that. It helps maintain stability, reduces brake wear, and helps you stay in control. You can find these fairly easily online, Fixparts Online usually has a good selection, but it’s one of those parts where a failing one is a definite safety concern so I’d recommend getting it sorted quickly.

Warranty Information

Wabco Load Sensing Valve (MPN 4756040430) comes with a 1-year warranty.