Wabco 4757010217 Automatic Load Sensing Valve

Description

The Wabco 4757010217 is an Automatic Load Sensing Valve crucial for maintaining optimal braking performance in air brake systems. This valve is primarily used in commercial vehicles and trailers to automatically adjust the braking force based on the vehicle's load. By dynamically regulating the air pressure delivered to the brakes, it ensures consistent and efficient stopping power regardless of how heavily the vehicle is loaded. The valve features actuation from -20° to +13°, a regulating ratio of 1:7, and operates with a maximum pressure of 10.0 bar. It's designed for mechanical, dynamic operation and mounts using 4x M8 bolts, with port threads of M22 x 1.5. Its dimensions are 152 x 141 x 114 mm. This valve is an OE specification exchange unit for 475 701 021 0 and operates effectively within a temperature range of -40°C to +80°C.

Key Features & Benefits

This valve basically balances the air brake force between the tractor and trailer. It measures how much weight is being carried – how loaded up the trailer is – and adjusts the air pressure sent to the trailer brakes accordingly. It’s got an arm that moves with the suspension, sensing the change in load. It then proportionally increases or decreases the air signal. Think of it like a smart regulator, constantly adjusting to make sure you’ve got the right braking power for what you’re hauling. It’s a mechanical – pneumatic device, so it uses both physical movement and air pressure to do its job. It’s a key component in the air brake system, specifically designed for tractor – trailers. It connects to the trailer’s suspension and sends a signal back to the tractor’s brake system. This tells the tractor how much air pressure to apply to the trailer brakes. Without it, you’d either be under – braking a heavy load—dangerous—or over – braking an empty or lightly loaded trailer, which causes excessive wear and tear, and can even lock up the trailer wheels. It works with the spring brakes, too, making sure everything’s cooperating.

Symptoms, Risks & Replacements

It’s really important for safety and preventing damage. If it fails, you'll notice if the trailer brakes aren't applying evenly or are weak, or if they're locking up too easily. That can cause a pull to one side during braking, making it very difficult to control the vehicle. It protects your brakes, tires, and suspension from premature wear, too. It's a pretty crucial safety item. You can find these at places like Fixparts Online, and I’d recommend getting a quality one; it's not a place to cut corners. A failing valve can lead to some serious issues down the road.

Warranty Information

Wabco Automatic Load Sensing Valve (MPN 4757010217) comes with a 1-year warranty.