The Haldex Air Brake Emergency Relay Valve is designed to provide precise and responsive control over the brake pressure. This valve is designed to be reliable and durable, and can help reduce downtime and increase productivity. It features four ports, allowing it to be used in a wide range of applications, including air brake systems, air suspension systems, and air-over-hydraulic systems. The valve is designed to be easy to install and maintain, and is constructed from high-quality materials for long-lasting performance. FleetPride is your First Click in Heavy Duty®.