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Maximum stopping force and fade‑resistant performance – The OEM Q4640822 Front Brake Friction Pad is engineered to provide consistent, high‑friction stopping power for SINOTRUK HOWO, SHACMAN, and other heavy‑duty commercial vehicles. Designed for disc brake systems on the front axle, these pads deliver short stopping distances even under full load.
Manufactured using a premium ceramic‑metallic friction formulation, these pads offer excellent heat dissipation, low rotor wear, and quiet operation. For guaranteed compatibility and certified safety, always choose genuine Sinotruk Homan parts.
The Q4640822 Front Brake Friction Pad features an integrally molded steel backing plate with a multi‑layer shim for noise and vibration damping. Its high‑density friction material resists glazing and maintains a stable coefficient of friction from -30°C to 500°C, ensuring reliable braking in all weather conditions.
The Q4640822 Front Brake Friction Pad is formulated with a low‑steel, ceramic‑enhanced NAO (non‑asbestos organic) compound that provides a high friction coefficient (μ = 0.45‑0.50) while being gentle on brake discs. Unlike cheap semi‑metallic pads, this material reduces dust and eliminates brake squeal.
The friction material is manufactured using a precision hot‑pressing process that ensures uniform density across the entire pad surface. This eliminates hot spots and guarantees even wear. The backing plate is shot‑blasted and coated with a corrosion‑resistant black epoxy, then fitted with an integral wear indicator that produces an audible warning when replacement is due.
Fleet operators using the Q4640822 report a 30% increase in pad life compared to standard aftermarket pads, with a 50% reduction in disc wear. The pads also perform exceptionally well in wet and muddy conditions, maintaining braking force without the “green fade” common in lower‑quality products.
Withstands peak temperatures of 600°C without μ drop. Maintains stopping power even after repeated heavy braking.
Ceramic‑metallic formula reduces disc wear by up to 40% compared to metal‑rich pads, extending brake rotor life.
Specially formulated underlayer absorbs vibration, eliminating brake squeal. Low‑dust compound keeps wheels cleaner.
| OEM Number | Q4640822 |
| Product Name | Front Brake Friction Pad (Disc Brake Pad Set) |
| Brand | SINOTRUK Homan |
| Material | Low‑steel ceramic‑metallic NAO (non‑asbestos organic) |
| Friction Coefficient (μ) | 0.45 – 0.50 (ECE R90 tested, class FF) |
| Pad Thickness (new) | 18.5 mm ±0.3 mm (friction material + backing plate) |
| Backing Plate Material | Stamped steel, zinc‑plated + black powder coat |
| Wear Indicator | Integrated mechanical audible spring (replacement at 3 mm) |
| Shim Type | Multi‑layer rubber‑steel composite (noise damping) |
| Max Continuous Operating Temp | 350°C |
| Peak Intermittent Temp | 600°C |
| Shear Strength (min) | 25 N/cm² (bond integrity test) |
| Wear Rate (mg/MJ) | ≤ 10 mg/MJ (SAE J661) |
| Standards Met | ECE R90, FMVSS 121, ISO 9001, IATF 16949 |
| Application | SINOTRUK HOWO front disc brake, SHACMAN F3000, ZF‑supplied axles |
The Q4640822 Front Brake Friction Pad is produced using a state‑of‑the‑art compression molding process. The raw friction mix (a blend of aramid fibers, ceramic particles, friction modifiers, and phenolic resin) is pre‑formed and then hot‑pressed directly onto the backing plate at 180°C and 200 bar. This ensures an inseparable bond between the friction material and the steel base, eliminating the risk of delamination.
After molding, the pads are post‑cured in an oven to fully polymerize the resin, stabilizing the friction properties. Each pad is then precision‑ground to achieve a flatness of less than 0.05 mm, ensuring full contact with the brake disc from the first application. The edges are chamfered to reduce noise and prevent glazing.
Every batch of pads is tested on a full‑scale inertia dynamometer per ECE R90. The test protocol includes 200 brake applications from 80 km/h to 20 km/h, measuring friction coefficient, fade, and recovery. Only pads that meet the strict OE specification (μ between 0.45 and 0.50 with less than 15% fade) are released for sale.
The Q4640822 incorporates a multi‑layer shim on the back of the pad. This shim consists of a rubber core sandwiched between two steel layers, which decouples the pad from the caliper piston. This design absorbs high‑frequency vibrations that cause brake squeal, ensuring quiet operation even in wet conditions.
Additionally, the friction material includes a low‑density underlayer that acts as a vibration damper. The combination of these features results in a pad that meets the strictest OEM standards for noise (≤ 70 dB during brake application).
The backing plate is also coated with a rubber‑based anti‑squeal adhesive on the contact surfaces, further reducing the risk of noise.
The Q4640822 Front Brake Friction Pad is a direct replacement for original equipment pads on SINOTRUK HOWO (all models with disc front brakes) and SHACMAN F3000. It also fits many ZF, Meritor, and WABCO calipers used on other heavy‑duty trucks.
When replacing, always install new pads as a set on both front wheels. Clean the caliper guides and apply high‑temperature grease to the contact points (but not to the friction surface). Replace the retaining clips and anti‑rattle springs if worn.
Bed‑in the new pads by performing 20 gentle stops from 50 km/h to 10 km/h, allowing them to cool between stops. This transfers a uniform layer of friction material to the disc, optimizing performance.
To safely replace front brake pads with the Q4640822, follow these steps: 1) Safely raise the front axle and remove the wheels.
2) Remove the caliper retaining bolts and lift the caliper off the disc. Hang the caliper using a wire – never let it dangle from the brake hose.
3) Remove the old pads and the anti‑rattle clips. Clean the caliper bracket and piston with a wire brush.
4) Compress the piston fully into the caliper using a brake piston tool or a large C‑clamp.
5) Install the new anti‑rattle clips (if provided) and insert the new Q4640822 pads. Ensure the wear indicator is oriented toward the disc rotation.
6) Reinstall the caliper and torque the bolts to 120 Nm (check vehicle manual). 7) Pump the brake pedal several times to bring the piston back in contact with the pads. Top up brake fluid if necessary.
8) Perform a burnish procedure as described above. Test brakes at low speed before returning to road.
Inspect the Q4640822 pads every 30,000 km. Measure the remaining friction thickness through the inspection hole in the caliper. Replace when the thickness is less than 4 mm (or when the wear indicator touches the disc).
Look for uneven wear (taper) – this may indicate a stuck caliper slide pin. Replace the pads and service the caliper immediately. If the pads are worn down to the backing plate, the disc may be damaged and should be inspected.
Never reuse old pads; always replace with a new set. Use new retaining clips every time, as they lose tension over time and can cause rattling.
Each batch of Q4640822 Front Brake Friction Pads undergoes rigorous quality control: (1) Friction performance test on an inertia dynamometer per ECE R90, (2) Shear strength test (≥25 N/cm²), (3) Compressibility test (≤2% at 100 bar), (4) Thermal cycle test (−40°C to +500°C, 20 cycles), (5) Salt spray corrosion test (240 hours, ASTM B117).
(6) Noise test on a vehicle brake dynamometer (SAE J2521), (7) Wear measurement (mg/MJ). The pads are manufactured in an IATF 16949 certified facility with full traceability from raw materials to finished product.
The Q4640822 carries the ECE R90 approval mark, verifying that it is a certified replacement for the original part.
A European long‑haul fleet operating 150 HOWO tractors equipped with the Q4640822 pads reported a 35% increase in pad life and a 50% reduction in disc wear compared to the previous supplier. Driver complaints of brake squeal dropped to near zero. The fleet also noted improved brake feel and reduced stopping distances in wet conditions.
A mining company in Australia using SHACMAN dump trucks found that the Q4640822 pads maintained braking performance even after repeated water crossings and mud exposure, while competitor pads glazed and lost effectiveness. The pads also exhibited minimal dusting, keeping the wheels cleaner.
Each set of Q4640822 Front Brake Friction Pads (4 pads – for both front wheels) is supplied in a color‑printed box with foam inserts to prevent damage. The box includes a set of new retaining clips and an installation guide.
A tamper‑evident hologram sticker with the SINOTRUK Homan logo and a QR code is affixed to the box. Scanning the link leads to the official authenticity portal. Counterfeit pads often have uneven friction material, missing shims, or incorrect backing plate shapes. Genuine pads have a smooth, uniform surface and a laser‑etched batch number.
Always purchase from authorized distributors. The genuine Q4640822 comes with a 12‑month / 60,000 km limited warranty against manufacturing defects.
Summary: The SINOTRUK Homan Front Brake Friction Pad (OEM Q4640822) delivers superior stopping power, fade resistance, and long service life for heavy‑duty trucks. Upgrade your front braking system with this genuine OEM pad – the trusted choice for safety and reliability.
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