Wabco 4758003010 Automatic Proportioning Valve

Description

The Wabco 4758003010 Automatic Proportioning Valve is a critical component in air brake systems, designed to automatically adjust brake force distribution based on load. This valve is commonly used in commercial vehicles and trailers to ensure optimal braking performance and stability. It features a regulation range of 0 to 7.2 bar and a regulating ratio of 1:5.3, allowing for precise control of brake pressure. The valve's mechanical operation and dynamic type of operation contribute to its reliability and responsiveness, enhancing overall safety and control. It has a mounting configuration of 2x Ø 9 mm, a bolt distance of 70 mm, and port threads of M12 x 1.5 for both ports. The valve is designed for operation within a temperature range of -40°C to +80°C and meets OE specifications.

Key Features & Benefits

This valve basically controls the hydraulic pressure going to the rear brakes. It balances the braking force between the front and rear, preventing the rear wheels from locking up before the front ones during hard braking. It does this automatically, adjusting the pressure based on how much load the vehicle is carrying and how hard you’re hitting the brakes. It's a mechanical thing, so it doesn’t need any electrical signals or adjustments. Think of it as a safety feature built into your brake system. It's positioned in the rear brake line, between the master cylinder and the rear wheel cylinders or calipers. It receives pressure from the master cylinder when you press the brake pedal, and then distributes that pressure to the rear brakes, but only up to a certain point. If the rear wheels start to feel like they're losing grip, it reduces the pressure going to them. It acts like a shield against rear wheel lockup.

Symptoms, Risks & Replacements

Without it, during heavy braking, especially with a loaded vehicle, the rear wheels are much more likely to lock up first. That can cause a skid, and you lose steering control. It's a really important part of keeping you safe, especially if you tow or haul things regularly. It’s something you’ll notice if it starts failing – usually it’ll feel like the rear brakes are grabbing or pulling to one side. You can find these fairly easily, places like Fixparts Online carry a good selection, and getting a new one isn’t usually too difficult. It's a relatively simple part but a critical one for overall brake performance.

Warranty Information

Wabco Automatic Proportioning Valve (MPN 4758003010) comes with a 1-year warranty.