Wabco 4733030030 Proportioning Valve

Description

The Wabco 4733030030 is a Proportioning Pressure Regulator, also known as a Proportioning Valve, designed for use in air brake systems. This valve maintains the correct air pressure distribution between the axles of a vehicle, ensuring optimal braking performance and stability. It is a critical component in commercial vehicles and trailers where consistent and reliable braking is paramount. The valve features a calculated volume of 1.966, an exhaust port of 12 mm, a limited backflow of 0.8 bar, and a maximum operating pressure of 10.2 bar. It has port threads of M16 x 1.5 JED - 388. With a regulating ratio of 1.15:1 and OE specification, this valve delivers precise pressure control and enhanced braking safety. Its dimensions are 104 x 136 x 139 mm and it is designed to operate effectively within a temperature range of -40°C to +80°C.

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 4733030030) comes with a 1-year warranty.