Wabco 4756041100 Load Sensing Valve

Description

The Wabco 4756041100 Load Sensing Valve is a critical component in air brake systems, responsible for maintaining consistent braking force regardless of vehicle load. It is typically used in the air suspension systems of commercial vehicles like trucks and buses. This mechanical, dynamically operated valve adjusts air pressure to the brakes based on the vehicle's load, ensuring optimal stopping power and stability. It features a flange mounting according to DIN 71501, M22 x 1.5 port threads, and an adjustable range of 0.7 to 1.2 / 2.8 to 3.5 bar. Its dimensions are 88 x 136 x 140 mm. The valve is designed to OE specification and operates effectively within a temperature range of -40°C to +80°C.

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 4756041100) comes with a 1-year warranty.