Front Brake Wheel Cylinder with High-Strength Cast Iron and 1-3/16" Bore Diameter for ISUZU NKR NPR 4BD1 4HF1
| Bore Diameter: | 1-3/16" (30.16mm) | Adjustment Gear: | 16 Teeth |
| Net Weight: | 1.215kg | Material: | High-strength Cast Iron |
| Bore Precision: | 30.16±0.013mm | Body Hardness: | HB190–230 |
| Pressure Seal: | 15MPa Static Pressure Held For 30 Seconds | Bore Surface Finish: | Ra≤0.4μm |
| High Light: | High-strength cast iron Front Brake Wheel Cylinder,1-3/16" bore diameter Brake Wheel Cylinder,16-tooth adjustment gear Wheel Cylinder |
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The Front Brake Wheel Cylinder with OEM numbers 8971398250 / 8-97139825-0 is a verified direct-fit replacement for ISUZU NKR / NPR series light trucks equipped with 4BD1 or 4HF1 engines. This wheel cylinder is a critical component of the front drum brake system (left-hand / front left position), 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 front 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.
Replace immediately if any occur:
- Brake Fluid Leakage — Visible oil stains around the wheel cylinder; brake fluid level drops consistently
- Vehicle Pulls to One Side — Vehicle veers to one side during braking; single-side cylinder sticking
- Low/Spongy Brake Pedal — Increased pedal travel; reduced braking force
- Brake Noise — Metallic grinding or squealing during braking
- Brake Drag — Vehicle feels like brakes are still applied after releasing pedal; pistons fail to retract
- Steering Wheel Vibration — Steering wheel shakes during high-speed braking (uneven front brake force)
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | ELF | NKR / NPR / NQR | 4BD1 / 4HF1 | — |
| ISUZU | ELF | NKR / NQR / NPR | 4BE1 / 4HG1 / 4HK1 / 4JJ1 | — |
| ISUZU | ELF | NKR55 | 4BD1 | 1999–2002 |
| ISUZU | NPR | NPR55/58/66/69/70/71 | 4HF1 | 1994–2000 |
| ISUZU | NPR | NPR59 | 4BD1/T 3.9L | 1984–1994 |
| ISUZU | NPR | NPR250 | 4HF1 4.3L | 1993–2006 |
| ISUZU | NPR TURBO | NPR | 4BD1 / 4HF1 | 1992– |
| ISUZU | NQR | — | 4HF1 / 4HG1 | — |
| ISUZU | NLR / NMR / NPS | — | 4BD1 / 4HF1 / 4JJ1 | — |
Important Notes:
- This is a FRONT LEFT (L.H.) brake wheel cylinder
- Confirm your vehicle has drum brake system before purchase
- Recommended to replace both left and right wheel cylinders simultaneously for balanced braking
- For 100% accurate fitment, please provide VIN (Chassis Number)
| 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 |
| Thread Inspection | Thread go/no-go gauge | M10*1 thread certified |
IMPORTANT: The brake system is critical to vehicle safety. Installation should be performed by qualified professionals. Always bleed the brake system and perform a road test after installation.
(Refer to workshop manual):
- Safety Prep: Park on level ground, chock wheels, lift and support vehicle
- Remove Old Cylinder: Disconnect brake line (catch draining fluid), remove mounting bolts (2*M10 bolts, torque 15–18N·m)
- Clean Mounting Surface: Thoroughly remove rust and debris from mounting face
- Install New Cylinder: Mount new cylinder, torque bolts to 15–18N·m
- Connect Brake Line: Attach brake hard line, torque to 14–16N·m
- Bleed Brake System: Bleed in sequence (RR → LR → RF → LF) until no air bubbles appear (use the copper bleeder screw)
- Adjust Clearance: Use the 16-tooth adjustment gear on the cylinder to set proper brake shoe clearance
- Road Test: Perform brake test at 30km/h — confirm smooth braking, no pulling, no noise
| 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 |
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