Wabco 4757110020 Automatic Load Sensing Valve

Description

The Wabco 4757110020 is an Automatic Load Sensing Valve crucial for maintaining optimal trailer braking performance. This valve is installed within the air brake system of trailers, dynamically adjusting braking force based on the trailer's load. It ensures consistent and safe stopping power, regardless of whether the trailer is fully loaded, partially loaded, or empty. The valve features a regulating ratio of 1:8 and operates pneumatically with a dynamic type of operation, responding quickly to changes in load conditions. It is compatible with a maximum operating pressure of 12.0 bar and operates effectively within a temperature range of -40°C to +80°C. This device mounts using 4x M8 bolts and has port threads of M16 x 1.5. Its dimensions are 12 x 307 x 207 mm. This valve adheres to OE specifications, guaranteeing a reliable and consistent fit and function.

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 4757110020) comes with a 1-year warranty.