Wabco 4757110940 Automatic Load Sensing Valve

Description

The Wabco 4757110940 Automatic Load Sensing Valve is a critical component in air brake systems, primarily used in commercial vehicles to regulate braking force based on vehicle load. It ensures optimal braking performance and stability by automatically adjusting the air pressure to the brakes. This valve is designed for pneumatic systems and operates dynamically, offering precise control of the air supply. It features a break point of 0.7 bar, a calculated volume of 7.744, a control pressure of 13.0 bar, and an adjustment range from 0.5 to 5.0 bar, with a regulating ratio of 1:8. The valve's dimensions are 110 x 220 x 320 mm, and it mounts using 4x M8 bolts. It includes M16 x 1.5 port threads for connections and an exhaust connection of snap on contour JED - 463. With a maximum operating pressure of 13.0 bar and a temperature range of -40°C to +80°C, this OE specification valve ensures reliable and consistent performance in demanding conditions.

Key Features & Benefits

This valve basically figures out how much weight is in your trailer, and then adjusts the air pressure going to the trailer brakes accordingly. It does this with a mechanical linkage – usually a rod that runs from the trailer’s spring suspension up to the valve. As the trailer gets heavier, the springs compress, and that movement tells the valve to send more air to the trailer brakes. It's a purely mechanical system, no electronics involved. It’s a key part of your trailer brake control system. Think of it like this: the tractor protection valve sets the maximum air pressure going to the trailer brakes, but this valve fine – tunes it based on how much load you're carrying. Without it, your trailer brakes might be too weak when fully loaded, or way too strong when empty – creating a safety hazard and wearing out your brakes prematurely. It ensures proportional braking, meaning the trailer brakes apply with the right amount of force for the weight it’s carrying.

Symptoms, Risks & Replacements

It's absolutely vital for safe and effective trailer braking. You'll notice if this valve goes bad, because your trailer’s braking will feel off – either not strong enough to stop reliably when loaded, or grabbing and skidding when empty. It prevents trailer sway, reduces stopping distances, and generally keeps you much safer on the road. It’s one of those things you don’t think about when it’s working right, but you’ll definitely know if it isn’t. If you're looking to replace one, you can find a good selection over at Fixparts Online, but any reputable truck parts supplier will carry them. Just make sure you get the right one for your setup.

Warranty Information

Wabco Automatic Load Sensing Valve (MPN 4757110940) comes with a 1-year warranty.