Wabco 4733000030 Load Proportioning Valve

Description

The Wabco 4733000030 Load Proportioning Valve is a critical component within air brake systems, designed to automatically adjust braking force to each axle based on vehicle load distribution. This valve is commonly used in commercial vehicles, trailers, and buses to ensure optimal braking performance and stability. Its dimensions are 124 x 134 x 164 mm. The valve features a break point of 1.5 bar, a calculated volume of 2.725, a bolt spacing of 60 mm, and a maximum operating pressure of 10.0 bar. It mounts with 2x Ø 9 mm bolts and has port threads of M22 x 1.5 / M12 x 1.5, 2x M22 x 1.5, and M12x1.5. This device maintains vehicle stability during braking by distributing force appropriately and operates within a temperature range of -40°C to +80°C, enhancing both safety and control.

Key Features & Benefits

This valve basically manages the air pressure going to the rear brakes based on how much weight the vehicle is carrying. It takes input from the suspension – how much it’s compressed, which tells it how loaded down the truck is – and adjusts the air pressure accordingly. It doesn’t just send a fixed amount of air back there. It increases pressure to the rear brakes as the load increases, and reduces it when the load is lighter. It’s a smart valve, really. Think of it as the brains behind balanced braking. On a vehicle with varying loads – you know, sometimes empty, sometimes fully loaded with cargo – the rear brakes need different levels of force. If you didn’t have this valve, you could end up with the rear brakes locking up before the front ones when the truck’s light, or not having enough stopping power in the rear when it’s heavy. It works with the rest of the air brake system to keep everything working smoothly and safely. It’s part of the air processing unit – it takes the air coming from the compressor and gets it ready to actually do something.

Symptoms, Risks & Replacements

It’s a safety thing, plain and simple. Without a properly functioning load proportioning valve, you’re risking uneven braking. That can cause pulling to one side during stops, longer stopping distances, and even wheel lockup, which, as you know, is dangerous. You’ll notice if this valve is failing because the truck might feel unstable when braking, especially when the weight in the back changes. It acts like a shield, protecting you from those unstable conditions. You can find these fairly easily, and Fixparts Online is a good place to start if you’re looking to replace one. It's one of those parts that doesn't get attention until it stops working right, but it's crucial for reliable stopping.

Warranty Information

Wabco Load Proportioning Valve (MPN 4733000030) comes with a 1-year warranty.