ISUZU Front Brake Wheel Cylinder 1-3/16 Inch Bore High-Strength Metal Construction OEM Standard Replacement for NPR 4HF1
| Gear Teeth: | 16 Teeth | Net Weight: | 1.09～1.25 Kg |
| Bore Size: | 1-3/16 Inch (30.16mm) | Brake Type: | Drum Brake |
| Installation Position: | Front Left (LH) | Material: | High-Strength Metal |
| Part Type: | Hydraulic Brake Wheel Cylinder Assembly | Piston-to-bore clearance: | Standard Range |
| High Light: | 1-3/16 Inch Bore Front Brake Wheel Cylinder,High-Strength Metal Construction Hydraulic Brake Wheel Cylinder Assembly,OEM Standard Replacement Brake Wheel Cylinder |
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The ISUZU Front Brake Wheel Cylinder with OEM numbers 8-97139821-0 / 8971398210 is a precision-engineered replacement designed for ISUZU NPR series 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.
| 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 |
| Brand | Model | Compatible Engine |
|---|---|---|
| ISUZU | NPR | 4HF1 |
| ISUZU | NKR | 4HF1, 4JJ1 |
| ISUZU | NQR | 4HF1 |
| ISUZU | NLR / NMR | 4HF1, 4JJ1 |
| ISUZU | NNR | 4HF1 |
| ISUZU | ELF | 4HF1 |
Provides adequate hydraulic thrust for responsive, reliable braking — industry-verified standard specification for NPR/4HF1 models.
Enables precise brake shoe clearance adjustment — ensures brake clearance stays within specification.
Excellent corrosion resistance and mechanical strength for long-term reliable operation under high-pressure, high-frequency braking conditions.
Effectively prevents brake fluid leakage and contamination — extends brake system service life.
Equipped with bleeder screw and gear-style adjuster — facilitates brake system bleeding and shoe clearance adjustment.
Manufactured to ISUZU original specifications — no modifications needed for quick, hassle-free installation.
- Number Confirmation: This product number is 8-97139821-0 / 8971398210. Reference numbers include 8-97022029-1 / 8970220291 and WC370001. Verify the specific number on the original part before ordering.
- Installation Position: This is the Front Left (LH) 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, it is recommended to 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.
| Item | Detail |
|---|---|
| Packaging | Neutral packaging or customized per customer request |
| Quantity per package | 1 pc/box (standard shipment packaging) |
| Product Net Weight | 1.09～1.25 kg |
| Brand | IZUMI / OEM Standard |
| Place of Origin | China |
| Minimum Order Quantity | 1 piece |
| Delivery Time | 5-30 working days |
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