Description
Maximize braking response speed and ensure precise pressure synchronization across your commercial fleet with the genuine Knorr-Bremse Air Brake Relay Valve Assembly. Engineered by global braking leader Knorr-Bremse, this robust relay valve assembly controls large volumes of compressed air directly from the air reservoirs to the brake chambers, drastically cutting down signal transmission delay. Worn internal diaphragms, sluggish valve pistons, and air leaks eventually compromise braking efficiency, leading to extended stopping distances and uneven brake wear. This heavy-duty replacement relay valve assembly solves those problems directly. It utilizes high-grade corrosion-resistant polymers, precision-machined internal valves, and high-flow exhaust ports to deliver lightning-fast brake application, eliminate pressure lag, and withstand severe commercial transport abuse.
Technical Parameters
| Category | Specifications & Technical Details |
| Millisecond Air Pressure Response & Signal Delay Elimination | We combine a large cross-section intake passage with a high-sensitivity pilot control piston. The moment the driver presses the brake pedal, the valve directly opens the reservoir main air circuit, achieving millisecond-level air pressure response and zero-delay braking. |
| High-Flow Large-Capacity Quick-Release Exhaust System | We integrate an optimized oversized exhaust port design. When the driver releases the brake pedal, it instantly vents the compressed air inside the brake chamber, completely preventing brake drag and reducing abnormal brake shoe wear. |
| Precision Anti-Aging Diaphragm & Piston Sealing | We manufacture the internal main control diaphragm and dynamic seals from specialty cold-resistant, oil-resistant elastomer material. They maintain flexible elasticity under extreme temperatures from -40°C to +80°C, eliminating internal air cross-leakage and external leakage. |
| OE Multi-Circuit Pressure Balancing & Proportional Control | We deliver precise cracking pressure calibration and a multi-circuit air pressure balancing mechanism. This ensures perfect synchronization and distribution of braking force across the front axle, rear axle, and trailer. |
| Industrial Corrosion-Resistant Anodized Aluminum & Composite Body | We build the valve body from a composite of high-strength anodized aluminum alloy and impact-resistant engineering plastic. It perfectly resists structural corrosion caused by de-icing salt, road moisture, and high-pressure washing. |
Applicable Car Brands & Models
Common warning symptoms include:
Sluggish Brake Response or Lag: A noticeable delay between pressing the brake pedal and the actual engagement of the wheel brakes.
Brake Drag or Slow Release: The brakes remain partially engaged or release slowly after letting go of the pedal, causing overheated wheel hubs.
Audible Air Leaks: Hissing sounds coming from the relay valve body or exhaust port while the brakes are held or released, indicating a ruptured internal diaphragm.
Uneven Braking or Pulling: Uneven air pressure delivery to the brake chambers causing the truck to pull to one side during braking.
While Knorr-Bremse offers official seal and diaphragm repair kits for minor maintenance, complete valve assembly replacement is strongly recommended if the internal aluminum bore is scored, heavily corroded, or if the mechanical piston fails. Complete replacement ensures immediate factory-calibrated safety and performance.
Yes, absolutely. After installing a new air brake relay valve assembly, technicians must test the entire pneumatic system using a gauge manifold to verify correct cracking pressures, check for air leaks using soapy water, and ensure proper synchronization between the service and emergency brake circuits.
Each relay valve assembly is fitted with protective plastic plugs over all air ports to block moisture and dirt ingress, wrapped in anti-corrosion barrier film, and packed inside a reinforced branded industrial box to protect the pneumatic components during global transit.
