The parking brake parts are critical for safely securing a parked commercial vehicle. A complete set of parking brake parts ensures reliable spring brake actuation and release. This genuine HOWO parking brake parts kit includes a check valve, multiple connector bodies, hose assemblies, and all necessary fasteners and sealing elements. When you choose authentic Howo Parts, you receive parking brake parts engineered specifically for the MAX 4X2 air brake system.
The hex flange nut M8 is a zinc plated, flanged nut used to secure various valve bodies and brackets in the parking brake circuit. Its integral flange distributes load and eliminates the need for a separate washer.
The elastic element NG8 is a polyurethane rubber cushion that absorbs vibration and allows limited angular misalignment in the NG8 pneumatic connections. It prevents metal to metal contact and extends component life.
The circlip NG8 is a spring steel snap ring that locks the elastic element inside the nut holder. It provides a secure, vibration proof retention mechanism for the parking brake parts assembly.
The nut holder NG8 is a zinc plated steel fitting that houses the elastic element and circlip. It provides a threaded connection point for mounting other brake components to the chassis.
The nut holder NG12 is a larger version of the NG8 holder, designed for NG12 size pneumatic lines. Six holders are supplied, used for heavier duty connections in the parking brake system.
The circlip NG12 is a snap ring for the NG12 nut holder. Six clips are provided, ensuring that each NG12 elastic element remains securely captured under vibration.
The elastic element NG12 is a larger polyurethane cushion for NG12 fittings. It provides shock absorption and angular compliance for the main parking brake air supply lines.
The spacer ring is a precision shim used to adjust the position of the nut holder relative to the mounting surface. Six rings are included, allowing fine adjustment of the parking brake parts assembly.
The plastic fastening belt B8*200 is a nylon cable tie used to bundle and secure air hoses and wiring harnesses. Six belts are supplied, each 200mm long and UV stabilized.
The check valve is a one way pneumatic valve that allows air to flow in only one direction. It prevents backflow from the spring brake chambers to the supply line, ensuring the parking brake remains engaged even if the main air system loses pressure.
The double connector body is a fitting that connects two air lines of the same size. It is used to join sections of the parking brake control circuit without additional adapters.
The brake plastic hose is a flexible PA12 nylon tube that carries compressed air to the parking brake actuators. Eight hoses are supplied, each rated for 12 bar working pressure and resistant to heat and chemicals.
The straight connector body NG8/NW6 is a reducing adapter that connects an NG8 pneumatic fitting to an NW6 hose. Two connectors are supplied, used where the parking brake system transitions between different line sizes.
The right-angle joint body NG12 / NW9 is a 90 degree fitting that redirects air flow in tight spaces. Three joints are supplied, ideal for routing parking brake lines around chassis obstructions.
The straight-through joint body NG12 / NW9 is a straight reducer that connects an NG12 fitting to an NW9 hose. Two joints are provided for inline connections where space permits.
The L-type T-junction body NW6 / NW9 / NW9 is a three way fitting with one NW6 inlet and two NW9 outlets. It is used to split the parking brake control signal to multiple spring brake chambers.
The T-type T-junction body NW6 / M12X1.5 / NW6 is a specialized tee with a metric thread port for mounting a pressure switch or test gauge. One unit is used for diagnostic access in the parking brake circuit.
The T-joint body NW9 / NG12 / TEST is a three way fitting with one NW9 port, one NG12 port, and a test connection. It allows for easy pressure testing of the parking brake system without disassembling lines.
Parking brake parts – genuine HOWO pneumatic brake components
| Material Encoding | Name |
|---|---|
| YZ952536000165 – Hex flange nut M8 | |
| WG9000361004 – Elastic element NG8 | |
| WG9000361005 – Circlip NG8 | |
| WG9000361006 – Nut holder NG8 | |
| WG9000361009 – Nut holder NG12 | |
| WG9000361008 – Circlip NG12 | |
| WG9000361007 – Elastic element NG12 | |
| WG9100360134 – Spacer ring | |
| WG9003171393 – Plastic fastening belt B8*200 | |
| WG9000360507 – Check valve | |
| WG9000361102 – Double connector body | |
| WG9000361106 – Brake plastic hose | |
| WG9000361204 – Straight connector body NG8/NW6 | |
| WG9000361101 – Right-angle joint body NG12 / NW9 | |
| WG9000361323 – Straight-through joint body NG12 / NW9 | |
| WG9000361321 – L-type T-junction body NW6 / NW9 / NW9 | |
| WG9000361406 – T-type T-junction body NW6 / M12X1.5 / NW6 | |
| WG9000361406 – T-joint body NW9 / NG12 / TEST | |
These parking brake parts include every valve, fitting, hose, and fastener needed to repair or maintain the spring brake circuit. The check valve prevents backflow, while the multiple T-junctions allow proper distribution of air to all brake chambers. No need to source individual components from different suppliers.
The combination of nut holders, circlips, and elastic elements (NG8 and NG12) creates a resilient, locking connection that absorbs chassis vibration. This prevents air leaks and loosening over time, ensuring the parking brake remains engaged when needed.
All parking brake parts are rated for 12 bar working pressure, with hoses burst tested to 60 bar. The polyamide hoses and polyurethane elastic elements operate from -40°C to +100°C, suitable for all African climates.
The inclusion of a T-joint with a test port and a T-type body with an M12x1.5 thread allows simple connection of pressure gauges or test switches. This makes troubleshooting the parking brake circuit faster and more accurate.
The parking brake system on the HOWO MAX 4X2 uses spring loaded brake chambers that are held off by air pressure. When the driver pulls the parking brake valve, air is exhausted from the spring chambers, allowing the powerful springs to apply the brakes. The check valve in these parking brake parts ensures that air cannot flow back into the chambers once they are exhausted, maintaining the parking brake even if the main air system leaks down.
The various connector bodies (straight, right-angle, L-type and T-type) route the control air from the valve to each of the rear axle spring chambers. The NG8 and NG12 nut holders, circlips and elastic elements provide sealed, flexible connections that can accommodate chassis flex without breaking. The plastic fastening belts keep the hoses organized and prevent chafing. Together, these parking brake parts form a reliable, leak free circuit that holds the vehicle stationary on any grade.
The check valve body is machined from brass with a nitrile rubber seal. The connector bodies are nickel plated brass for corrosion resistance. The brake plastic hose is extruded from BASF Ultramid polyamide 12, which resists diesel, oil and road salt.
The elastic elements are molded from flame retardant polyurethane (UL 94 V-2). The circlips are spring steel with a black oxide finish. The nut holders are zinc plated steel. Every parking brake part is tested for burst pressure and leak tightness before leaving the factory. The hose assembly is proof tested at 24 bar.
Before starting, drain the air system and disconnect the battery. Remove the old components, cleaning the mounting surfaces. Assemble the nut holders, elastic elements and circlips for each connection point. Install the check valve in the supply line with the arrow pointing toward the spring chambers.
Connect the plastic hoses using the straight, right-angle and T-junction bodies, cutting the hose to length with a sharp knife. Use the plastic fastening belts to secure the hoses to the chassis every 300mm. Install the T-joint with test port in a convenient location for future diagnostics. After all connections are made, pressurize the system and apply soapy water to check for leaks.
Tighten any leaking fittings slightly. Finally, test the parking brake application and release several times to ensure correct operation.
These parking brake parts are designed for the WABCO pneumatic system used on HOWO MAX 4X2 tractors from 2018 onward.
The NG8 and NG12 fittings match the standard port sizes on the spring brake chambers and parking brake valve. The check valve is compatible with the 12mm supply line. For vehicles with aftermarket brake chambers or valves, verify the thread sizes before ordering. The brake plastic hose is the same diameter (6mm OD for NW6, 9mm OD for NW9, 12mm OD for NG12) as the original equipment.
Inspect the parking brake parts every 50,000 km. Check all plastic hoses for chafing, cuts or bulges. Examine the elastic elements for cracking or hardening. Ensure the check valve operates by applying air pressure and confirming flow only in the allowed direction. Retorque any loose nut holders.
The plastic fastening belts should be replaced if they show signs of weathering. If the parking brake does not apply or release properly, use the test port to measure pressure at the spring chambers. A sticking check valve is a common failure – replace it with a genuine HOWO part. Do not attempt to repair a leaking connector body; replace the entire fitting.
If the parking brake fails to hold the vehicle on a slope, first check the check valve for backflow. Apply air pressure to the supply side and see if pressure builds on the chamber side when the supply is exhausted. If it does, the check valve is leaking and must be replaced.
If the brakes release slowly, inspect the exhaust port on the parking brake valve for blockage. If there is a hissing sound from the T-joints, tighten the fittings or replace the sealing rings. If a plastic hose is cracked, cut out the damaged section and install a new straight connector body. Always use genuine HOWO parking brake parts for replacements, as generic fittings may have different taper angles and will leak.
Aftermarket check valves often use lower grade rubber seals that swell and fail within months. The connector bodies may be made from plated steel instead of brass, leading to internal rust and blockage. The elastic elements in generic kits are made from cheap polyurethane that hardens in sunlight. The plastic hoses may not be UV stabilized, becoming brittle and cracking.
The circlips may be made from soft wire that bends and loses retention. Genuine HOWO parking brake parts are manufactured to the original equipment specifications, using certified materials and rigorous quality control. The small additional cost of genuine parts is quickly offset by reduced downtime and the safety of knowing the parking brake will hold.
All parking brake parts are RoHS and REACH compliant. The plastic hoses and elastic elements are recyclable. The brass fittings can be melted down and reused. The packaging consists of a corrugated cardboard box with dividers to separate the components. The box is recyclable. The manufacturing facility is ISO 14001 certified.
The complete parking brake parts kit includes all 18 components listed in the parameters table. Individual components can be ordered separately using their material encodings. Authorized HOWO dealers in Nigeria stock these genuine parts. For fleet orders of five or more complete kits, volume discounts are available. Always provide your vehicle’s VIN to confirm compatibility. Each component is backed by a 12 month warranty against manufacturing defects.
Fleet managers who have installed this genuine HOWO parking brake parts kit report a significant reduction in brake system faults. The check valve has eliminated creep on slopes, and the vibration proof connections have stopped the chronic air leaks that were common with aftermarket fittings.
The plastic fastening belts keep the hose bundles tidy, making inspections easier. Many operators have adopted this kit as their standard parking brake repair set, citing the complete all in one nature and the long term reliability of the genuine components.
The parking brake parts kit is shipped in a sturdy cardboard box measuring 40cm x 30cm x 15cm, weight 2.5 kg. The plastic hoses are coiled without kinking. The small components are sealed in poly bags. Store the kit in a dry indoor area away from direct sunlight. The shelf life is five years. Do not open the poly bags until ready to install.
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