9730090020 WABCO Trailer Brake Control Valve Tractor Trailer Valve for Heavy Duty Pneumatic Brake System

The WABCO WABCO Trailer Control Valve (part number 9730090020) is a replacement component for the air brake and air suspension systems of heavy-duty trucks, buses and semi-trailers. It is built to original equipment specification from quality materials, so it installs on the original mounting points and performs reliably throughout the service life of the vehicle. Key ratings include Max Working Pressure 8.5 bar, temperature range -40°C ~ +80°C, Port Thread M22*1.5 for main ports, M16*1.5 control port, Mounting 4*M8 bolts, mounting hole spacing 85*85 mm, dimension 193*144*139 mm.

By metering the air that reaches the trailer brake chambers, the valve synchronizes trailer braking with the tractor and removes the dangerous lag that can otherwise cause a jack-knife. Stable pressure output and a robust body keep performance consistent over years of heavy-duty service.

Every unit is manufactured to original equipment specification and inspected before it leaves the factory, so it matches the fit, function and durability of the original part. Sealed, vibration-tested construction keeps performance stable in the heat, dust, road salt and constant vibration found on commercial vehicles, and standard interfaces make installation and maintenance straightforward. Spare parts, technical data and fitting advice are available on request.

• Max Working pressure:8.5 Bar: Temperature range -40°C ~ +80°C.
• Port Thread: M22*1.5 for Main Ports: M16*1.5 control port.
• Mounting: 4*M8 Bolts: Mounting hole spacing 85*85 mm, dimension 193*144*139 mm.
• It Synchronizes Braking Between Tractor and Trailer: Controls air supply to trailer brake chambers.
• Stable Braking Response: Balances brake force, reduces trailer brake lag.
• OE Original Quality: Durable under vibration and harsh working conditions.

The valve is used on the pneumatic brake systems of semi-trailers, including container chassis, tippers, tankers and flatbeds. It is essential for any combination where the trailer must brake in step with the tractor to avoid jack-knifing and to keep stopping distances short.

Every unit is packed in a neutral export carton with foam protection so that ports, connectors and levers arrive free from damage. OEM cartons and private labels are available on request, and each carton is labelled with the part number for simple warehouse handling. All units are produced to original equipment specification and inspected before shipment; a twelve-month quality warranty and full technical support are provided, and mixed containers can be supplied for distributors and repair workshops. Please contact us for samples, volume discount pricing and confirmed lead times.