Wabco 4742000010 Secondary Brake Valve

Description

The Wabco 4742000010 is a secondary brake valve crucial for maintaining optimal braking performance in air brake systems. This valve is commonly used in commercial vehicles, including trucks and trailers, to control the air pressure to the secondary brake circuits, ensuring reliable and safe stopping power. Its robust design, incorporating a bayonet electrical connection (DIN 72 585 A1-2.1-Sn/K1) and multiple port threads (M22 x 1.5, M16 x 1.5), offers a secure and leak-free operation. The valve features a normally closed configuration, an operating pressure of up to 20.0 bar, and is protected to IP 6K4K / IP 6K9K standards. With dimensions of 160 x 120 x 120 mm, this OE specification valve provides dependable performance across a wide temperature range, from -40°C to +80°C.

Key Features & Benefits

This valve basically manages the air pressure going to the rear axle brakes, especially when you're dealing with a situation where the front brakes might fail or lose pressure. It's designed to apply the rear brakes automatically if it detects a significant drop in pressure in the primary braking system – the one connected to your foot pedal. It also allows you to manually apply just the rear brakes with a separate control, often a lever or button in the cab. Think of it as a backup system and a way to give you extra control, particularly with heavier loads or when you need to slow down gradually without stressing the front brakes. It’s a crucial part of the air brake system on larger vehicles like trucks, buses, and trailers. It doesn’t replace your regular brakes, it works with them. It's there to provide an added layer of safety and control, mostly for the rear brakes. It ensures that even if you have a problem up front, you still have reliable stopping power on the back wheels. It's connected to the air reservoir, the brake chambers on the rear axle, and the primary brake lines.

Symptoms, Risks & Replacements

This valve is really important for safety, plain and simple. If the primary system fails, you’ll notice if this isn’t working properly because the rear brakes won’t engage as they should. That could lead to significantly increased stopping distances or even a loss of control. It also prevents the rear brakes from locking up unexpectedly. It’s one of those things you really want functioning perfectly before you get on the road. You can find a good replacement for it at places like Fixparts Online if you need one. It’s a fairly straightforward part to replace if you’re comfortable working on air brake systems, but definitely something to get checked by a professional if you’re not sure.

Warranty Information

Wabco Secondary Brake Valve (MPN 4742000010) comes with a 1-year warranty.