Front Brake Wheel Cylinder 1-3/16 Inch Bore High-Strength Cast Iron 12 MPa Pressure Rating for ISUZU NKR NPR 4HF1
Basic Properties
Place of Origin:
CHINA
Brand Name:
YIMI
Certification:
ISO/TS16949
Model Number:
NKR NPR 4HF1 4BE1
Trading Properties
Minimum Order Quantity:
20 PCS
Price:
Negotiable
Payment Terms:
T/T
Supply Ability:
10000 pcs/month
Specifications
| Bore Size: | 1-3/16 Inch (30.16mm / 30.163mm) | Brake Type: | Drum Brake |
| Installation Position: | Front Right (RH) | Net Weight: | 1.089～1.11 Kg |
| Pressure Rating: | 12 MPa (1,740 PSI) | Bleeder Screw: | Included |
| Material: | High-Strength Cast Iron | Mounting Holes: | 4 Holes |
| High Light: | 1-3/16 Inch Bore Front Brake Wheel Cylinder,High-Strength Cast Iron Brake Wheel Cylinder,12 MPa Pressure Rating Hydraulic Brake Wheel Cylinder Assembly |
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Product Description
Front Brake Wheel Cylinder 8971398180 8-97139818-0 for ISUZU NKR NPR 4HF1 4BE1 — 1-3/16" Bore Verified OEM Replacement
Product Overview
ISUZU Front Brake Wheel Cylinder with OEM numbers 8-97139818-0 / 8971398180 is a precision-engineered replacement designed for ISUZU NKR and NPR series light-duty trucks, compatible with 4HF1 diesel engines. This component serves as the core actuation element of the vehicle's hydraulic braking system — the Front Right Brake Wheel Cylinder Assembly — responsible for converting hydraulic pressure from the master cylinder into mechanical force to push the brake shoes against the brake drum.
Numbering Note: This product number is 8-97139818-0 / 8971398180. Same-series numbers include 8-97022030-1 / 8970220301 and 8-97022030-0 / 8970220300. Cross-reference numbers include SEIKEN SW-G353, TRW BWN787, RAYBESTOS WC370002. Please verify the specific number based on actual vehicle configuration.
Working Principle
The brake wheel cylinder is a critical actuation component of the hydraulic braking system, mounted on the brake backing plate and connected to the master cylinder via brake fluid lines.
- Hydraulic Input: When the driver depresses the brake pedal, the master cylinder converts pedal force into hydraulic pressure transmitted through the brake fluid lines.
- Piston Actuation: Hydraulic pressure pushes the piston inside the wheel cylinder outward.
- Brake Shoe Expansion: The piston transmits force through the push rod to the brake shoes, expanding them against the rotating brake drum to generate friction for deceleration.
- Brake Release: When the driver releases the brake pedal, hydraulic pressure is released and return springs pull the piston back, separating the brake shoes from the drum.
Failure Symptoms
Inspect immediately if any of these occur:
| Symptom | Probable Cause |
|---|---|
| Reduced braking performance; increased stopping distance | Worn internal seals; hydraulic leakage; insufficient braking force |
| Vehicle pulls to one side during braking | Single-side cylinder malfunction; uneven braking force |
| Brake drag; vehicle still feels braked after pedal release | Stuck piston; cylinder fails to return |
| Visible brake fluid leakage at the wheel cylinder area | Worn/damaged cylinder seals |
| Soft or spongy brake pedal; increased pedal travel | Internal leakage or air in hydraulic system |
Technical Specifications
Bore Size: 1-3/16 Inch (30.16mm / 30.163mm)
Material Standard: High-Strength Cast Iron
Pressure Rating: 12 MPa (1,740 PSI)
Position: Front Right (RH)
Mounting Holes: 4 precision-machined holes
Bleeder Screw: Standard
Brand Certification: IZUMI, KOMP - ISO/TS16949 certified
Warranty: 1 year / 30,000 km
| Part Number: | 8971398180 8-97139818-0 |
| Product Name: | Brake Wheel Cylinder |
| Car Model: | ISUZU NKR NPR |
| Engine Model: | 4HF1 4BE1 |
| Condition: | 100% Brand New |
| Origin: | China Mainland |
Compatibility Information
Primary Applications:
| Brand | Model | Compatible Engine | Years |
|---|---|---|---|
| ISUZU | NKR | 4HF1 | 1992–2001 |
| ISUZU | NPR | 4HF1 | 1992–2001 |
| ISUZU | ELF | 4HF1, 4BE1 | 1992–2001 |
Extended Applications:
- ISUZU ELF Platform (NKR7_, NKS7_, NHR6_, NKR6_, NPR_6) - 3.1 TD / 4.3 TD (1992–2001)
- ISUZU NQR - 4HF1, 4BE1
- ISUZU NPS - 4HF1, 4BE1
- ISUZU NLR / NMR - 4HF1, 4BE1
- ISUZU NKQ - 4HF1
- ISUZU NKR65 / NPR66 / NPR70 - 4HF1, 4HG1, 4HE1 (1994–2000)
Important Fitment Warnings
- Number Confirmation: This product number is 8-97139818-0 / 8971398180. Same-series numbers include 8-97022030-0 / 8970220300 and 8-97022030-1 / 8970220301. Verify the specific number on the original part before ordering.
- Installation Position: This is the Front Right (RH) brake wheel cylinder. Confirm whether the left or right side is needed.
- Pair Replacement Recommended: Brake wheel cylinders should be replaced in pairs (left and right) to ensure balanced braking force.
- Associated Components: When replacing the wheel cylinder, inspect brake shoes, brake drums, and brake lines — replace if necessary.
- Brake Fluid Replacement: Replace brake fluid (DOT 3 or DOT 4) and bleed the hydraulic system when replacing the wheel cylinder.
- Professional Installation: The brake wheel cylinder is a critical braking system safety component — professional installation is strongly recommended.
Features & Benefits
| Feature | Benefit + Verification Signal |
|---|---|
| 1-3/16 Inch Precision Bore (30.16mm) | Provides adequate hydraulic thrust for responsive, reliable braking — industry-verified standard specification for NKR/NPR/4HF1 models. |
| High-Strength Cast Iron Construction | Excellent corrosion resistance and mechanical strength for long-term reliable operation under high-pressure, high-frequency braking conditions. |
| 12 MPa (1,740 PSI) Pressure Rating | Ensures stable, reliable braking force output under high-load braking conditions — industry-verified. |
| Complete Service Design | Equipped with bleeder screw — facilitates brake system bleeding and maintenance. |
| ISO/TS16949 Quality Management Certified | Internationally recognized automotive industry quality standard — ensures full-process quality control. |
| 100% Factory Quality Inspection | Every piece undergoes strict quality inspection — ensures zero-defect delivery. |
| 1 Year / 30,000 km Warranty | Reliable after-sales protection — 1 year or 30,000 km quality guarantee. |
| Broad OEM Cross-Compatibility | Replaces multiple OEM and aftermarket numbers — simplifies sourcing for repair shops. |
Quality Control & Verification
| QC Item | Inspection Method | Acceptance Criterion |
|---|---|---|
| Cylinder bore size | Bore gauge / CMM | 1-3/16 inch (30.16mm) ± tolerance |
| Piston-to-bore clearance | Special gauges | Standard range |
| Seal integrity | Visual + dimensional inspection | No damage, no deformation |
| Hydraulic seal test | Pressure test bench | 12 MPa no leakage; stable pressure retention |
| Material composition | Spectrometer | Per cast iron standard |
| Surface anti-corrosion | Salt spray test (ISO 9227) | Per anti-corrosion standard |
Installation & Maintenance
IMPORTANT SAFETY NOTICE: The brake wheel cylinder is a critical braking system safety component that directly affects vehicle braking performance and driving safety. Professional installation with specialized tools is strongly recommended.
Installation Guidelines (Reference Workshop Manual):
- Preparation: Confirm installation position (Front Right) and part number; prepare tools and brake fluid
- Removing Old Wheel Cylinder: Secure vehicle, remove wheel, disconnect brake line, remove old cylinder
- Installing New Wheel Cylinder: Clean mounting surface, install new cylinder, connect brake line, fill fluid, bleed system
- Post-Installation Checks: Brake pedal feel check, leak check, road test
Maintenance Schedule:
| Item | Interval | Notes |
|---|---|---|
| Brake fluid inspection | Every 10,000 km / each service | Check fluid level and color |
| Wheel cylinder & line leak check | Every 20,000 km | Check for brake fluid seepage |
| Brake fluid replacement | Every 2 years / 40,000 km | Brake fluid absorbs moisture |
| Wheel cylinder inspection | Upon symptom occurrence | Inspect/repair/replace if leakage or sticking detected |
Packaging & Supply
| Packaging: | Neutral packaging or customized per customer request |
| Quantity per package: | 1 pc/box (standard shipment packaging) |
| Product Net Weight: | 1.089～1.11 kg |
| Brand: | IZUMI / KOMP / OEM Standard |
| Place of Origin: | China |
| Minimum Order Quantity: | 1 piece |
| Delivery Time: | 5–8 working days |
| Supply Capacity: | 1000 pieces/month |
| Warranty: | 1 year / 30,000 km |
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