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Sinotruk Howo Truck Sapre Parts Relay Valve WG9000360524
| Parameter | Description |
|---|---|
| Model No. | WG9000360524 |
| Type | Pneumatic Control Relay Valve |
| Function | Accelerates brake application and release by reducing air transmission delay between brake pedal valve and brake chambers |
| Material | Metal body (typically cast aluminum or steel alloy) with internal rubber seals and diaphragm |
| Weight | Approx. 0.6 kg (standard version), some variants up to 1.0 kg |
| Installation Location | Mounted on the rear frame rail, close to rear axle brake chambers |
| Connected Components | Air reservoir (tank), brake hoses, brake chambers (actuators), foot valve (brake pedal control) |
| Operating Principle | Uses pilot pressure from the foot valve to open inlet valve, allowing direct flow from air tank to brake chamber |
| Design Feature | Fast charging & quick exhaust design for rapid brake response and release |
| Quality Certification | Complies with ISO 9001 Quality Management System |
| Customization Support | Yes – OEM branding, custom labeling, and packaging available |
| Packaging | Standard carton box; customized packaging options supported |
| Warranty Period | Varies by supplier: typically 3 months to 1 year |
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| Brand | Compatible Models |
|---|---|
| HOWO (Sinotruk) | A7, T5G, T7H, TH7, TX, NX, MAX, H7 |
| SITRAK | C7H |
| HAOHAN (Haohan) | N5G, N6G, N7G |
| HAOKA (Haoka) | H7 |
| Golden Prince (Jin Wangzi) | Jin Wangzi series |
| Steyr-based Models | Various Steyr-derived Sinotruk heavy trucks |
Reduced Brake Response Time
Acts as a "booster" in the air brake system — receives low-pressure pilot signal from the brake valve and directly controls high-volume airflow from the air reservoir to the brake chamber. This bypasses long air lines, significantly speeding up rear brake actuation.
Optimized for Heavy-Load Operation
Specifically engineered for heavy-duty transport scenarios such as:
Dump trucks
Tractor-trailers (semi-trucks)
Construction haulers
Maintains stable pressure delivery even under full load and rough terrain.
Smooth Brake Release (Quick Exhaust Function)
When brake pedal is released:
Internal spring returns the diaphragm
Inlet valve closes immediately
Exhaust valve opens rapidly to vent air from brake chamber
Ensures prompt and complete release of brakes without drag or delay.
Improved Braking Synchronization
Enhances coordination between front and rear axles, reducing skidding risk and improving overall vehicle stability during braking.
While WG9000360524 is the primary Sinotruk OE number, it has several compatible or equivalent replacements:
| Type | Model Number |
|---|---|
| Sinotruk Derivatives | WG9000360524/1, WG9000360524/2 |
| WABCO Equivalent | 973 011 001 0 (Commonly used in international markets and aftermarket supply) |
| Aftermarket Replacements | Look for “Relay Valve for Sinotruk WG9000360524” — verify fitment via dimensions and port configuration |
⚠️ Always confirm interchangeability using technical specs or consult manufacturer data before substitution.
Rear Axle Brake Systems in multi-axle heavy trucks
High-frequency braking operations: e.g., urban delivery, mountain descent, construction sites
Long-haul freight transportation requiring consistent and fail-safe braking performance
Ambient temperatures: -40°C to +80°C
High humidity, dusty environments (with proper maintenance)
Vehicles operating on poor road surfaces or steep gradients
Regular Leak Inspection
Check all air connections (inlet, outlet, control port) for signs of leakage. Common issues include worn O-rings, cracked hoses, or loose fittings.
➤ Symptoms of failure: Delayed brake response, weak rear braking, or incomplete brake release.
Drain Moisture Regularly
Condensation can accumulate in the air system and freeze in cold weather, leading to valve blockage or corrosion.
➤ Use the drain plug at the bottom of the valve/reservoir to remove water periodically.
➤ Recommended: Daily drainage in winter or humid climates.
Correct Installation & Routing
Supply line → from air tank
Output line → to rear brake chamber
Control line → from brake valve (pilot signal)
➤ Incorrect connection may cause unintended braking or no-brake condition.
Install securely on the chassis with anti-vibration mounts.
Ensure correct hose routing:
Use Genuine or Matched Replacement Parts
Avoid mixing different types or models of relay valves — mismatched components may result in inconsistent pressure output or delayed response.
Inspect Internally for Contamination
In harsh environments (dust, sand, salt), debris may enter the valve and damage the diaphragm or seat. Disassemble and inspect if performance degrades.
Scheduled Maintenance
Include relay valve inspection in routine maintenance every 6 months or 60,000 km, especially for vehicles used in:
Mining
Quarrying
Off-road hauling
Avoid Exposure to Oil or Chemicals
Lubricants or cleaning agents may degrade rubber seals — use only approved brake system cleaners.
