This little valve basically takes the high pressure from your brake system and lowers it for a specific part of the brakes, usually the rear brakes on vehicles with air brakes, or sometimes on trucks with hydraulic systems. It reduces the force going to those rear wheels. It’s designed to limit the amount of braking force applied to the rear axles, preventing them from locking up before the front. It does this using internal springs and a diaphragm that reacts to the air or hydraulic pressure. Think of it as a safety net. On heavier vehicles, especially, the rear brakes can naturally grab harder than the front during a stop. This valve ensures a more balanced and controlled braking experience. It's most common on trucks, trailers, and larger vans—vehicles where weight distribution is a bigger concern. It’s part of the whole air or hydraulic brake system working together to keep you safe and in control. If this valve fails, you’ll notice if you’re driving a vehicle that's sensitive to rear brake lockup. The rear brakes might grab too quickly, leading to skids, especially in wet or slippery conditions. It can make it difficult to maintain a straight line when braking and increase stopping distances. It’s crucial for stability and preventing loss of control, so it's something you definitely want to keep in good working order. We carry a good range of these at Fixparts Online, if you’re looking to replace yours. A faulty one just isn’t worth the risk. Choose quality: Brake Pressure Reducer Valve (MPN 3.72201) is backed by a 12-month warranty!

About DT

Diesel Technic specializes in high-quality spare parts for commercial vehicles, offering reliability and durability for fleets worldwide.

Why Choose DT?

• We have a huge selection of parts, so you’re likely to find what you need, fast. • Our parts are high quality and built to last, saving you money in the long run. • We offer fast, reliable shipping right to your door. • Our customer service team is friendly and knowledgeable – we're here to help! DT – trusted quality, available at FixParts Online!