WABCO Relay Emergency Valve 9710020400 Trailer Emergency Brake Relay for 3 Axle Semi Trailer ABS

The WABCO WABCO Relay Emergency Valve (part number 9710020400) 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 10 bar, temperature range -40°C ~ +65°C, Port Thread M22*1.5 and M16*1.5, with built-in silencer, Adjustment Range 0.7 bar, mounting hole spacing 71mm.

Combining relay braking and emergency braking in one compact body, the valve supplies air to the brake chambers quickly and applies the trailer brakes automatically if the trailer is ever separated from the tractor. This double function simplifies the trailer air circuit and adds an important layer of safety.

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:10 Bar: Temperature range -40°C ~ +65°C.
• Port Thread: M22*1.5 and M16*1.5: With built-in silencer.
• Adjustment range:0.7 Bar: Mounting hole spacing 71mm.
• When the Trailer Disconnects From Tractor: It triggers emergency braking automatically.
• Quickly Supplies Air to Brake Chambers For: Fast braking response.
• OE Original Quality: Stable performance, suitable for 3-axle semi-trailers with ABS.

The valve is used on the pneumatic brake systems of 3-axle semi-trailers fitted with ABS, including container chassis, curtainsiders, tippers and tankers. It is a key safety component that couples rapid service braking with automatic emergency braking when the trailer is separated from the tractor.

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.