Wabco 4733030020 Proportioning Valve

Description

The Wabco 4733030020 Proportioning Valve is a critical component within air brake systems, specifically functioning as part of the air processing unit. It is designed to regulate air pressure distribution to the axles of vehicles, ensuring optimal braking performance and stability. This valve effectively controls the pressure applied to the rear brakes, preventing wheel lockup during braking and maintaining vehicle control. With dimensions of 104 x 131 x 137 mm, this OE specification device offers precise pressure regulation with a regulating ratio of 1.5:1, operating effectively within a temperature range of -40°C to +80°C. The valve features M16 x 1.5 JED - 388 port threads for both connections and a calculated volume of 1.8665, while it’s designed with a limited backflow of 0.8 bar and a maximum operating pressure of 10.2 bar.

Key Features & Benefits

This little valve basically regulates the air pressure going to the rear brakes compared to the front. It’s all about balance. It takes the air pressure from your foot applying the brakes and distributes it in a way that prevents the rear wheels from locking up before the front ones. It does this mechanically, based on how much force you’re applying. More pressure, more balance, less pressure, it scales back a bit. It’s a pretty simple device, actually, but does a crucial job. Think of it like this—your front brakes do the bulk of the stopping, especially in an emergency. The rears help, but they’re more prone to locking if they get too much pressure. This valve ensures that the rear brakes don’t grab too hard, which would throw off your steering and potentially cause a skid. It's part of the overall air brake system, working with everything else to slow and stop the vehicle safely. It’s a critical piece in maintaining stability during braking.

Symptoms, Risks & Replacements

If this valve fails, you’ll notice if you're doing a brake test that the rear brakes might lock up too easily, especially in harder stops. That can lead to loss of control—you don’t want your rear wheels locked while you're trying to steer! Or, it could cause uneven braking which is never a good feeling. It really is important for safety. You can find a good replacement on sites like Fixparts Online, and honestly, if you're dealing with air brakes, it's always a good idea to keep a spare on hand. They aren't overly expensive, and peace of mind is worth it.

Warranty Information

Wabco Proportioning Valve (MPN 4733030020) comes with a 1-year warranty.