ISUZU Brake Master Cylinder Assembly 1-1/16 Inch Bore OEM Standard Replacement ISO/TS16949 Certified for NKR55 4JB1
| Bore Size: | 1-1/16 Inch (26.98 Mm) | Material: | Aluminum Alloy / Cast Iron |
| Product Weight: | 0.85 Kg To 4.39 Kg | Compatible Engine: | ISUZU 4JB1 |
| Compatible Models: | ISUZU NKR55 | Part Type: | Hydraulic Brake Master Cylinder Assembly |
| Supply Capacity: | 1000 Sets/month | Minimum Order Quantity: | 10 Pieces |
| High Light: | 1-1/16 Inch Bore Brake Master Cylinder,OEM Standard Replacement Brake Master Cylinder,ISO/TS16949 Certified Brake Master Cylinder |
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The ISUZU Brake Master Cylinder Assembly with OEM numbers 8-94441331-0 / 8944413310 is a precision-engineered replacement designed for ISUZU NKR55 series light-duty trucks, compatible with 4JB1 diesel engines. This component is the core power source of the vehicle's hydraulic braking system, responsible for converting mechanical force from the brake pedal into hydraulic pressure for vehicle deceleration and stopping.
The brake master cylinder is the core component of the hydraulic braking system, typically integrated with the brake fluid reservoir. When the driver depresses the brake pedal, the pedal pushes the piston inside the master cylinder through a push rod, converting mechanical force into hydraulic pressure. The master cylinder typically features a tandem dual-chamber design, separately controlling the front and rear brake circuits to ensure that if one circuit fails, the other can still provide braking force.
| Symptom | Probable Cause |
|---|---|
| Brake pedal feels soft or spongy with increased travel | Worn internal seals; hydraulic leakage or internal bypass |
| Visible brake fluid leakage (under pedal, around master cylinder) | Damaged/worn master cylinder seals; external fluid leak |
| Brake pedal fails to return or returns slowly | Failed return spring or stuck piston inside master cylinder |
| Brake fluid appears dark, brown, or cloudy | Old brake fluid; internal seal wear contaminating fluid |
| Vehicle pulls to one side during braking | Uneven pressure between circuits; imbalanced front/rear braking force |
| Increased stopping distance | Master cylinder unable to provide adequate hydraulic pressure |
| Part Number | 8-94441331-0 8944413310 |
| Product Name | Brake Master Cylinder |
| Car Model | NKR55 |
| Engine Model | 4JB1 |
| Condition | 100% Brand New |
| Origin | China Mainland |
| Main Market | Middle East, Asia, Africa, South America, North America & Europe |
| Package | Neutral Packing Or Make It As Requested |
| Material | High-strength aluminum alloy & precision bearings |
Primary Vehicle Applications:
| Brand | Model Series | Compatible Engine | Years | Notes |
|---|---|---|---|---|
| ISUZU | NKR55 | 4JB1 | 1985–1998 | Light-duty truck, 2.8L |
| ISUZU | NKR | 4JB1 | — | Light-duty truck |
| ISUZU | NHR | 4JB1 | — | Light-duty truck |
| ISUZU | ELF | 4JB1 | — | Light-duty truck |
| JMC | 1030 | 4JB1 | — | Light-duty truck |
- Number Confirmation: This product number is 8-94441331-0 / 8944413310. The series also includes 8-94249365-0 / 894249365. Verify the specific number on the original part before ordering.
- Left/Right-Hand Drive: Some sources indicate this product is for RHD (Right-Hand Drive) models. Confirm vehicle steering configuration before ordering.
- Pair Replacement Recommended: When replacing the master cylinder, it is recommended to replace brake fluid simultaneously and inspect brake lines and wheel cylinders/calipers.
- System Bleeding Required: After installation, brake system bleeding is mandatory — start from the farthest wheel (right rear) to remove air from lines.
- Installation Torque: Refer to ISUZU factory workshop manual for mounting bolt and brake line fitting torque specifications.
- Professional Installation: The brake master cylinder is a critical braking system safety component — professional installation is strongly recommended.
| Feature | Benefit + Verification Signal |
|---|---|
| ISO/TS16949 Quality Management Certified | Internationally recognized automotive industry quality standard — ensures full-process quality control from design to production |
| IZUMI Brand Professional Supply | Mature production systems and extensive industry experience — provides global customers with reliable automotive parts solutions |
| 1-1/16 Inch (26.98mm) Precision Bore | Provides adequate brake fluid flow and pressure for responsive, reliable braking — meets the braking demands of ISUZU NKR55 4JB1 2.8L diesel engines |
| Precision Machining & Rigorous Sealing Design | Ensures stable hydraulic pressure transmission and rapid brake response — effectively reduces stopping distance and enhances driving safety |
| 100% Factory Quality Inspection | Every piece undergoes strict quality inspection — ensures zero-defect delivery |
| Broad OEM Cross-Compatibility | Replaces OEM numbers 8-94441331-0 / 8944413310; compatible with 8-94249365-0 / 894249365 — fits NKR55, NKR, NHR, ELF, JMC 1030 models |
| Flexible Supply (Small Orders Accepted) | MOQ 10 pieces, delivery 5–8 working days, supply capacity 1000 sets/month — meets diverse procurement needs |
| QC Item | Inspection Method | Acceptance Criterion | Frequency |
|---|---|---|---|
| Cylinder bore size | Bore gauge / CMM | 1-1/16 inch (26.98mm) ± tolerance | 100% |
| Piston-to-bore clearance | Special gauges | Standard range | Batch sampling |
| Seal integrity | Visual + dimensional inspection | No damage, no deformation | 100% |
| Hydraulic seal test | Pressure test bench | No leakage; stable pressure retention | 100% |
| Material composition | Spectrometer | Per aluminum/cast iron standard | Batch sampling |
| Surface anti-corrosion | Salt spray test | Per anti-corrosion standard | Annual sampling |
| Thread size & precision | Thread gauge | Per standard thread specification | Batch sampling |
| Visual inspection | Visual | No scratches, burrs, or rust | 100% |
Installation Guidelines (Reference Workshop Manual):
Preparation:
- Confirm installation position and part number (8-94441331-0)
- Prepare tools: Socket wrench, brake fluid (DOT3/DOT4), brake line wrench, drain container, torque wrench
- Recommended to prepare new brake fluid and brake line sealing washers
Removing Old Master Cylinder:
- Park vehicle on level surface and engage parking brake
- Remove brake fluid reservoir (if integrated with master cylinder, remove as assembly)
- Use a brake line wrench to disconnect brake fluid lines from the old master cylinder (prepare container for fluid)
- Remove bolts or fasteners securing the old master cylinder
- Carefully remove the old brake master cylinder
Installing New Master Cylinder (Installation Sequence):
- Clean mounting surface: Thoroughly clean the master cylinder mounting surface and vacuum booster (if equipped) — ensure no oil, dirt, or debris
- Install new master cylinder: Position and secure the new master cylinder; torque mounting bolts to specification
- Connect brake lines: Reconnect brake fluid lines — ensure threaded connections are tight and leak-free
- Fill brake fluid: Fill reservoir with DOT3/DOT4 specification brake fluid to correct level
- Brake system bleeding: Mandatory — bleed brake system starting from the farthest wheel (right rear), removing air from lines until brake pedal feels firm
- Leak check: Inspect all brake line connections and cylinder body — confirm no brake fluid leakage
Post-Installation Checks (Mandatory):
- Brake pedal feel check: Depress brake pedal — confirm firm feel, no sponginess, normal travel
- Leak check: Inspect all brake line connections and cylinder body — confirm no brake fluid leakage
- Road test: Perform low-speed road test — confirm balanced braking, no pulling, no abnormal noise, normal stopping distance
Maintenance Schedule:
| Item | Interval | Notes |
|---|---|---|
| Brake fluid inspection | Every 10,000 km / each service | Check fluid level and color; brake fluid should be clear |
| Master 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; long-term use degrades performance |
| Master cylinder inspection | Upon symptom occurrence | Inspect/repair/replace if leakage or sticking detected |
| Packaging | Neutral packaging or customized per customer request |
| Quantity per package | 1 pc/box (standard shipment packaging) |
| Product Net Weight | Approx. 0.85 kg |
| Brand | IZUMI |
| Place of Origin | Guangdong, China |
| Customization Options | OEM custom packaging / neutral packaging / private labeling |
| Minimum Order Quantity | 10 pieces |
| Delivery Time | 5–8 working days |
| Supply Capacity | 1000 sets/month |
| Payment Terms | L/C, D/A, D/P, T/T, Western Union |
| Target Customers | Truck parts wholesalers, light-duty truck repair shops, fleet purchasers, export traders |
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