ISUZU Front Brake Wheel Cylinder 1-3/16 Inch Bore with High-Strength Cast Iron Housing and Corrosion-Resistant Finish for NKR NPR 4HF1
| Bore Size: | 1-3/16 Inch (30.16mm / 30.163mm) | Installation Position: | Front Left (LH) |
| Material: | High-strength Cast Iron Housing + Corrosion-resistant Finish | Piston Assembly: | Precision-machined Piston Assembly |
| Brake Type: | Drum Brake | Part Type: | Hydraulic Brake Wheel Cylinder Assembly |
| Model Years: | 1990–2010 | OEM Part Number: | 8-97139819-0 / 8971398190 |
| High Light: | 1-3/16 Inch Bore Front Brake Wheel Cylinder,High-Strength Cast Iron Housing Brake Wheel Cylinder,Corrosion-Resistant Finish Hydraulic Brake Wheel Cylinder Assembly |
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The ISUZU Front Brake Wheel Cylinder with OEM numbers 8-97139819-0 / 8971398190 is a precision-engineered replacement designed for ISUZU NKR and NPR series light-duty trucks, compatible with 4HF1 diesel engines. This component is a core actuation element of the vehicle's hydraulic braking system — the Front Left 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.
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.
Inspect immediately if any of these symptoms 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 |
| Part Number | 8-97139819-0 8971398190 |
| Product Name | Front Brake Wheel Cylinder |
| Car Model | NKR NPR |
| Engine Model | 4HF1 |
| Bore Size | 1-3/16 Inch (30.16mm / 30.163mm) |
| Installation Position | Front Left (LH) |
| Material | High-Strength Cast Iron with corrosion-resistant finish |
| Model Years | 1990–2010 |
| Condition | 100% Brand New |
| Place of Origin | China |
Primary Applications:
| Brand | Model | Compatible Engine | Years |
|---|---|---|---|
| ISUZU | NKR | 4HF1 | 1990–2010 |
| ISUZU | NPR | 4HF1 | 1990–2010 |
Extended Applications: ELF, NQR, NLR, NMR, NNR, NKQ series with 4HF1 engines
- Number Confirmation: Verify the specific number on the original part before ordering
- Installation Position: This is the Front Left (LH) brake wheel cylinder
- Pair Replacement Recommended: Brake wheel cylinders should be replaced in pairs (left and right) to ensure balanced braking force
- Associated Components: Inspect brake shoes, brake drums, and brake lines when replacing the wheel cylinder
- Brake Fluid Replacement: Replace brake fluid (DOT 3 or DOT 4) and bleed the hydraulic system
- Professional Installation: Critical braking system safety component — professional installation strongly recommended
| 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 | No leakage; stable pressure retention |
| Material composition | Spectrometer | Per high-strength cast iron standard |
Preparation:
- Confirm installation position (Front Left) and part number (8-97139819-0)
- Prepare tools: Socket wrench, brake line wrench, torque wrench, brake fluid (DOT 3 or DOT 4)
- Recommended to also prepare: Brake shoes, brake drum, brake fluid
Installation Sequence:
- Clean mounting surface thoroughly
- Install new cylinder and torque mounting bolts to specification
- Reconnect brake fluid line with tight, leak-free connection
- Fill master cylinder reservoir with DOT 3 or DOT 4 brake fluid
- Bleed brake system starting from farthest wheel
- Inspect all connections for leaks
Post-Installation Checks (Mandatory):
- Brake pedal feel check — confirm firm feel, no sponginess
- Leak check — confirm no brake fluid leakage
- Road test — confirm balanced braking, no pulling, normal stopping distance
| Packaging | Neutral packaging or customized per customer request |
| Quantity per package | 1 pc/box (standard shipment packaging) |
| Brand | OEM Standard / IZUMI |
| Place of Origin | China |
| Minimum Order Quantity | 1 piece |
| Delivery Time | 5–30 working days |
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