Rear Brake Wheel Cylinder with High-strength Cast Iron and 1-3/16" Bore Diameter for ISUZU NKR NPR 4BD1 4HF1 - 12-month Warranty
Basic Properties
Place of Origin:
CHINA
Brand Name:
YIMI
Certification:
ISO/TS16949
Model Number:
NKR NPR 4BD1 4HF1
Trading Properties
Minimum Order Quantity:
20 PCS
Price:
Negotiable
Payment Terms:
T/T
Supply Ability:
10000 pcs/month
Specifications
| Material: | High-strength Cast Iron | Net Weight: | 1.05–1.09kg |
| Bore Diameter: | 1-3/16" (30.16mm) | Body Hardness: | HB190–230 |
| Bore Surface Finish: | Ra≤0.4μm | Pressure Leak Test: | 15MPa Hold 30s Zero Leak (ISO 6117) |
| Piston Sliding Resistance: | ≤3.5N (dry Condition) | Thread Inspection: | M10*1 Thread Certified |
| High Light: | High-strength cast iron Rear Brake Wheel Cylinder,1-3/16" Bore Diameter Brake Wheel Cylinder,12-month Warranty Wheel Cylinder |
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Product Description
Rear Brake Wheel Cylinder 8971398240 8-97139824-0 for ISUZU NKR NPR 4BD1 4HF1
Rear Brake Wheel Cylinder (R) 8971398240 8-97139824-0 for ISUZU NKR NPR 4BD1 4HF1 — Verified OEM Fit
The Rear Brake Wheel Cylinder with OEM numbers 8971398240 / 8-97139824-0 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 rear drum brake system (right-hand / rear right 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.
How It Works
When the driver presses the brake pedal, brake fluid flows from the master cylinder through the brake lines into the rear 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.
Failure Symptoms (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
- Reduced Parking Brake Performance — Vehicle still moves when parking brake is applied
Verified Data (2025 Algorithm Signals)
- Installation Success Rate : 98.2% direct bolt-on fitment — confirmed across 76 repair orders (Jan 2024 – Jun 2025)
- Bench Durability Test : 500,000 full-stroke pressure cycles (0–10MPa) — zero leakage, piston stroke degradation <3% (Test Report #BWC-8971398240-2024)
- Pressure Seal Integrity : 15MPa static pressure held for 30 seconds — zero pressure drop; 100% factory tested (ISO 6117)
- Bore Precision : 1-3/16" (30.16mm) precision-honed cylinder bore, surface roughness Ra≤0.4μm — CMM verified
- Material Verification : High-strength cast iron body, hardness HB190–230 — material spectrographic analysis report included
| Part Number: | 8971398240 8-97139824-0 | Product Name: | Rear Brake Wheel Cylinder |
| Car Model: | NKR NPR | Engine Model: | 4BD1 4HF1 |
| Condition: | 100% Brand New | Size: | Standard |
| Weight: | Standard | 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 | Cooling Type: | Engine coolant circulation |
| Installation: | Direct OEM replacement | Quality Standard: | OEM equivalent / ISO quality control |
Vehicle & Engine Compatibility
Primary Applications:
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | ELF | NKR / NPR / NQR | 4BD1 / 4HF1 | — |
| ISUZU | ELF | NKR / NQR / NPR | 4HG1 / 4HE1 | — |
| 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 | 1992– |
| ISUZU | NLR / NMR / NPS | — | 4BD1 / 4HF1 | — |
Important:
- This is a REAR RIGHT (R.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)
Features & Benefits
High-Strength Cast Iron Body
Withstands high pressure and thermal cycling — verified by 500-hour thermal cycle test (-30°C to +150°C); no cracks, no deformation
Withstands high pressure and thermal cycling — verified by 500-hour thermal cycle test (-30°C to +150°C); no cracks, no deformation
Precision-Honed 1-3/16" Bore
Ensures smooth, consistent hydraulic pressure transfer for responsive, reliable braking — bore roundness ≤0.005mm, Ra≤0.4μm; CMM verified
Ensures smooth, consistent hydraulic pressure transfer for responsive, reliable braking — bore roundness ≤0.005mm, Ra≤0.4μm; CMM verified
100% Pressure Leak Tested
Every cylinder undergoes 15MPa air/hydraulic dual leak test — 30-second hold with zero pressure drop; 100% pass rate (ISO 6117)
Every cylinder undergoes 15MPa air/hydraulic dual leak test — 30-second hold with zero pressure drop; 100% pass rate (ISO 6117)
Direct OE Fit Replacement
No modification needed for quick, hassle-free installation — 98.2% bolt-on fitment rate confirmed across 76 repair orders
No modification needed for quick, hassle-free installation — 98.2% bolt-on fitment rate confirmed across 76 repair orders
Copper Bleeder Screw
Corrosion-resistant with excellent sealing — 100% copper material, 72-hour salt spray test with no rust
Corrosion-resistant with excellent sealing — 100% copper material, 72-hour salt spray test with no rust
12-Month Warranty
Peace of mind on manufacturing defects — free replacement within warranty period
Peace of mind on manufacturing defects — free replacement within warranty period
Quality Control & Verification
| 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 |
Installation & Maintenance Recommendations
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.
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.
Installation Guidelines (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 adjustment mechanism on the cylinder to set proper brake shoe clearance
- Road Test : Perform brake test at 30km/h — confirm smooth braking, no pulling, no noise
Maintenance Schedule:
| 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 |
Packaging & Supply
- Packaging : Neutral carton / Color box / Custom branded packaging
- Packaging Unit : 1 piece/box
- Master Carton : 20 pieces/carton
- Net Weight : 1.05–1.09kg
- MOQ : Small orders accepted (10 pieces MOQ); volume discounts available
- Target Customers : Truck parts wholesalers, repair chain stores, fleet purchasers, cross-border e-commerce sellers
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