The part system on the HOWO MAX 4X2 tractor is a critical safety component responsible for the majority of the vehicle’s stopping power. This Front axle brake kit includes the essential hydraulic and pneumatic connection components – brake hoses, T-junction bodies, pressure test joints, nuts, O-ring seals, and backup washers – engineered to ensure reliable, leak-free brake operation. When you choose authentic Howo Parts, this Front axle brake hardware set guarantees OE fitment and consistent brake performance. Below are detailed descriptions of every component included with this Front axle brake assembly.
The brake hose is a flexible, reinforced rubber hose that connects the chassis-mounted brake lines to the moving brake caliper or wheel cylinder on The part system. This hose is made from EPDM rubber with a textile braid and steel wire reinforcement, capable of withstanding brake fluid pressures up to 120 bar and temperatures from -40°C to +100°C. The hose has crimped end fittings that match the standard M22x1.5 and M12x1.5 ports, ensuring a secure, leak-proof connection. Regular inspection of The part hoses is essential as they are subject to flexing and environmental wear; any cracking or bulging requires immediate replacement to maintain brake performance.
This ferrule-type T-junction body is a multi-port brass or steel fitting that distributes brake fluid or air to different circuits on The part system. It features three ports with thread sizes M22x1.5, M12x1.5, and M18x1.5, allowing connection to brake hoses, pressure sensors, and other components.
The ferrule design ensures a metal-to-metal seal when tightened, providing leak-free performance under high pressure. This component is critical for routing brake pressure from the master cylinder to both front wheels, maintaining balanced braking force on The part. Its corrosion-resistant finish ensures long service life in harsh under-vehicle conditions.
The pressure test joint assembly is a dedicated port that allows the brake system pressure to be measured for diagnostic purposes. This Front axle brake component includes a threaded body, a sealing seat, and a protective cap. It is installed inline on The part hydraulic circuit, providing a convenient access point for a pressure gauge. Regular pressure testing through this joint ensures that The part system maintains the correct operating pressure (typically 80-100 bar) and can identify leaks or pump malfunctions early. The assembly is made from zinc-plated steel and is compatible with standard M14 or M18 test adapters.
The hexagon nut is a standard fastener used to secure the pressure test joint, the T-junction body, and other fittings on The part. These nuts are made from high-strength steel with a zinc-nickel coating for corrosion resistance.
They have a fine or coarse thread matching the respective studs (M16x1.5, M14x1.5, etc.) and are torqued to specification to ensure a leak-free seal. Correct torque is vital; under-tightening can cause fluid leaks, while over-tightening may damage the fitting threads. Always replace the hexagon nut if its threads are damaged to maintain the integrity of The part.
The O-ring seal is a precisely sized elastomer ring that provides a static seal between mating metal surfaces in The part hydraulic connections. Made from FPM (fluorocarbon rubber), it is compatible with DOT 3, DOT 4, and DOT 5.1 brake fluids,
as well as high operating temperatures up to 150°C. The O-ring fits into a groove on the fitting and is compressed when the nut is tightened, creating a positive seal that prevents brake fluid leakage. These seals must be replaced whenever a fitting is disconnected, as the rubber takes a compression set over time. Using a genuine O-ring seal ensures the correct material and dimensions for The part.
The backup washer is a hardened steel washer used under the hexagon nut on M22x1.5 threaded fittings to prevent the nut from biting into the softer joint body and to distribute the clamping load evenly. This Front axle brake washer also protects the O-ring from extrusion under high pressure. It is made from zinc-plated spring steel and is dimensioned to fit perfectly over the threads. The backup washer ensures that the sealing force is applied uniformly, maintaining a leak-free joint even under the high pressures generated during hard braking. Replace this washer whenever the corresponding nut is removed to ensure consistent sealing performance on The part.
Front axle brake – genuine HOWO front brake hydraulic and pneumatic hardware kit for MAX 4X2
This Front axle brake kit includes all hoses, junction bodies, test joints, nuts, seals, and washers needed to service the hydraulic and pneumatic connections of the front brake circuit. No additional hardware is required for a full front brake line overhaul.
All Front axle brake fittings and hoses are rated for operating pressures up to 150 bar, exceeding the typical 80-100 bar of the front brake circuit. This ensures a safety margin and long-term reliability, even under emergency braking.
The part components are constructed from brass, zinc-plated steel, and FPM rubber, offering excellent resistance to brake fluid, road salt, and moisture. This protects the connections from rust and ensures easy disassembly during future maintenance.
Every Front axle brake component is manufactured to SINOTRUK’s original dimensions and thread specifications. The T-junction body, hoses, and test joints are precision-machined for a perfect fit with the factory brake lines.
The part system on the HOWO MAX 4X2 is a hydraulic or pneumatic (air) brake circuit that provides the primary stopping force. When the driver depresses the brake pedal, the master cylinder (or foot valve) generates hydraulic pressure (or air pressure) that travels through the brake lines. This pressure enters The part circuit via the ferrule-type T-junction body, which splits the pressure equally to both front wheels.
The brake hoses carry this pressure to the wheel cylinders or brake calipers, where it actuates the brake pads or shoes against the rotors or drums. The pressure test joint allows technicians to check that The part is maintaining the correct pressure, ensuring balanced braking. The O-ring seals and backup washers prevent fluid loss at every connection, maintaining system integrity. Without properly functioning Front axle brake connections, brake performance would be compromised, leading to longer stopping distances and potential brake failure.
Before installation, depressurise the brake system and disconnect the battery. Remove the old Front axle brake hoses, T-junction, and fittings. Clean all mounting surfaces and pipe ends. Install the new T-junction body onto the chassis bracket, securing it with the hexagon nuts and backup washers (torque to 40 Nm). Attach the brake hoses to the T-junction and to the wheel cylinders,
ensuring the ferrule connections are fully seated. Install new O-ring seals onto each fitting before tightening. Install the pressure test joint into the circuit at the designated port, using a new O-ring and nut. Tighten all connections to the specified torque: hose fittings 25 Nm, test joint 30 Nm. After installation, bleed The part system to remove air, then pressurise and check for leaks. The part hardware is now ready for service.
If The part feels spongy or the pedal travels too far, air may be trapped in the system or the brake fluid level may be low. Bleed The part circuit and check for leaks. A hissing sound from the brake hoses indicates a cracked hose – replace the affected hose immediately. If The part drags or pulls to one side, the T-junction may be blocked or the pressure distribution uneven.
Inspect the T-junction and clean or replace it. A persistent leak from a fitting usually means a damaged O-ring or under-tightened nut; replace the O-ring and retorque. Always use genuine Front axle brake components to ensure correct sealing and pressure ratings.
Inspect The part hoses, fittings, and seals at every scheduled maintenance (every 30,000 km). Check the brake hoses for cracks, bulges, or chafing. Ensure all nuts and unions are tight – retorque if necessary. Replace the O-ring seals and backup washers whenever a connection is broken to prevent leaks. Use the pressure test joint to verify the system pressure annually.
If the vehicle operates in severe environments (heavy salt, extreme heat), inspect The part connections more frequently. Keep The part area clean and free from debris to prevent corrosion. A well-maintained Front axle brake ensures reliable stopping power and extends the life of the brake components.
This Front axle brake hardware kit is specifically designed for the HOWO MAX 4X2 tractor, compatible with all production years from 2018 onward. It also fits SITRAK C7H and HOWO T7H models that share the same front brake architecture. The T-junction body with M22x1.5 / M12x1.5 / M18x1.5 ports matches the standard connections on The part lines. The brake hoses are pre-formed for the correct routing and length. This Front axle brake kit is not compatible with older A7 or WD615 models, which use different thread sizes and hose lengths. Always verify your vehicle’s VIN and brake system type before ordering.
Aftermarket Front axle brake hoses may use inferior rubber that cracks prematurely, leading to sudden fluid loss and brake failure. Generic T-junction bodies might have incorrect port sizes or poor internal flow, causing uneven brake application. Counterfeit O-rings may be made from NBR instead of FPM, swelling or hardening in brake fluid, resulting in leaks.
The hexagon nuts and backup washers in non-genuine kits may have wrong thread pitch or soft material, stripping under torque. Genuine HOWO Front axle brake components are manufactured to SINOTRUK’s exacting standards, using certified materials, precise machining, and quality-controlled seals. The small additional cost of a genuine Front axle brake kit is negligible compared to the safety risk of brake system failure.
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