Yimi (Guangzhou) Automotive Parts Co, Ltd
| Gear Teeth | 16 teeth |
| Delivery Time | 5-8 Work Days |
| Bore Diameter | 1-3/16" (30.16mm) |
| Mounting Diameter | 34mm |
| Mounting Hole Spacing | 52mm |
| Payment Terms | T/T |
| Material | High-strength cast iron |
| Supply Ability | 10000 pcs/month |
| Bolt Torque | 15–18N·m |
| Thread Size | M10×1 |
| Packaging Details | Neutral Package or as customers’ request |
| Net Weight | 1.09kg |
| Model Number | NPR 4HF1 |
| Certification | ISO/TS16949 |
| Brand Name | YIMI |
| Place of Origin | CHINA |
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Product Specification
| Gear Teeth | 16 teeth | Delivery Time | 5-8 Work Days |
| Bore Diameter | 1-3/16" (30.16mm) | Mounting Diameter | 34mm |
| Mounting Hole Spacing | 52mm | Payment Terms | T/T |
| Material | High-strength cast iron | Supply Ability | 10000 pcs/month |
| Bolt Torque | 15–18N·m | Thread Size | M10×1 |
| Packaging Details | Neutral Package or as customers’ request | Net Weight | 1.09kg |
| Model Number | NPR 4HF1 | Certification | ISO/TS16949 |
| Brand Name | YIMI | Place of Origin | CHINA |
| High Light | High-strength cast iron Brake Wheel Cylinder ，1-3/16" bore diameter Wheel Cylinder ，Direct OEM replacement Front Brake Wheel Cylinder | ||
The Front Brake Wheel Cylinder with OEM numbers 8971398210 / 8-97139821-0 is a verified direct-fit replacement for ISUZU NPR series trucks equipped with the 4HF1 engine. This wheel cylinder is a critical component of the drum brake system, responsible for converting hydraulic pressure from the brake master cylinder into mechanical force that pushes the brake shoes against the brake drum, slowing or stopping the vehicle.
When the driver presses the brake pedal, brake fluid flows from the master cylinder through the brake lines into the wheel cylinder. The hydraulic pressure forces the pistons inside the cylinder outward, pushing the brake shoes against the inner surface of the brake drum. Friction converts the vehicle's kinetic energy into heat, achieving braking. When the pedal is released, return springs retract the pistons, releasing the brakes.
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | ELF 250 | NKR66 | 4HF1 | 1994–1998 |
| ISUZU | ELF 350 | NQR55/58/59/65/66/69/70/71 | 4HF1 | 1994–2000 |
| ISUZU | NPR | NPR55/58/66/69/70/71 | 4HF1 | 1994–2000 |
| ISUZU | NPR | NPR250 | 4HF1 4.3L | 1993–2006 |
| Feature | Benefit + Verification Signal |
|---|---|
| High-Strength Cast Iron Body | Withstands high pressure and thermal cycling — verified by 500-hour thermal cycle test (-30°C to +150°C); no cracks, no deformation |
| Precision-Honed 1-3/16" Bore | Ensures smooth, consistent hydraulic pressure transfer for responsive, reliable braking — bore roundness ≤0.005mm, Ra≤0.4μm; CMM verified |
| 100% Pressure Leak Tested | Every cylinder undergoes 15MPa air/hydraulic dual leak test — 30-second hold with zero pressure drop; 100% pass rate (ISO 6117) |
| Direct OE Fit Replacement | No modification needed for quick, hassle-free installation — 98.7% bolt-on fitment rate confirmed across 127 repair orders |
| Includes Bleeder Screw & Gear Adjuster | Easy brake system bleeding and shoe gap adjustment — 16-tooth adjustment gear for convenient maintenance |
| 12-Month / 50,000 km Warranty | Peace of mind on manufacturing defects — free replacement within warranty period |
| QC Item | Verification Method | Standard |
|---|---|---|
| Material Composition | Spectrographic analysis | Meets HT250 cast iron standard |
| Body Hardness | Brinell hardness tester | HB190–230 |
| Bore Dimensional Accuracy | CMM coordinate measuring machine | 30.16±0.013mm |
| Bore Surface Finish | Roughness tester | Ra≤0.4μm |
| Pressure Leak Test | Air + hydraulic dual test | 15MPa hold 30s zero leak (ISO 6117) |
| Piston Sliding Resistance | Universal testing machine | ≤3.5N (dry condition) |
| Durability Test | Bench cycle test | 500,000 full-stroke pressure cycles no failure |
| Visual & Dimensional Inspection | 100% visual + gauge inspection | No porosity, blowholes, or burrs |
| Item | Interval |
|---|---|
| Brake Fluid Replacement | Every 2 years or 40,000 km |
| Wheel Cylinder Inspection | Every 10,000 km or 6 months |
| Brake Shoe Inspection | Every 10,000 km |
| Cylinder Replacement | When leakage/sticking occurs, or at 80,000–100,000 km |
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Exporter,Trading Company,Seller
Year Established:
2005
Total Annual:
8000000-10000000
Employee Number:
100~150
Ecer Certification：
Verified Supplier
Yimi (Guangzhou) Automotive Parts Co., Ltd. Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ... Yimi (Guangzhou) Automotive Parts Co., Ltd. Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ...
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