ISUZU Rear Brake Wheel Cylinder 1-3/16 Inch Bore High-Strength Metal OEM Standard Replacement for NKR NPR 4BD1 4HF1
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 Metal | Net Weight: | 1.23～1.382 Kg |
| Installation Position: | Rear Right (RH) | Brake Type: | Drum Brake |
| Part Type: | Hydraulic Brake Wheel Cylinder Assembly | Bore Size: | 1-3/16 Inch (30.16mm) |
| Compatible Engines: | ISUZU 4BD1, 4HF1 | Extended Engine Compatibility: | ISUZU 4HG1, 4JJ1 |
| High Light: | 1-3/16 Inch Bore Rear Brake Wheel Cylinder,High-Strength Metal Hydraulic Brake Wheel Cylinder Assembly,OEM Standard Replacement Brake Wheel Cylinder |
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Product Description
ISUZU Rear Brake Wheel Cylinder 8-97139822-0 8971398220
Precision-engineered replacement for ISUZU NKR and NPR series light-duty trucks, compatible with 4BD1 and 4HF1 diesel engines. This rear right brake wheel cylinder assembly converts hydraulic pressure into mechanical force to push brake shoes against the brake drum.
Part Number Note: This product number is 8-97139822-0 / 8971398220. Reference numbers include 8-97139-822-0-NAP and 8970221411. Brands include IZUMI, NAP, Axcel, BGF, and SANYCO. Please verify specific number and installation position based on actual vehicle configuration.
Product Specifications
| Part Number | 8-97139822-0 8971398220 |
| Product Name | Rear Brake Wheel Cylinder |
| Car Model | NKR NPR |
| Engine Model | 4BD1 4HF1 |
| Bore Size | 1-3/16 Inch (30.16mm) |
| Installation Position | Rear Right (RH) |
| Material | High-strength aluminum alloy & precision bearings |
| Net Weight | 1.23～1.382 kg |
| HS Code | 870830000 |
| Condition | 100% Brand New |
| Origin | China Mainland |
Working Principle
The brake wheel cylinder is mounted on the brake backing plate and connected to the master cylinder via brake fluid lines:
- Hydraulic Input: Master cylinder converts pedal force into hydraulic pressure
- Piston Actuation: Hydraulic pressure pushes piston outward
- Brake Shoe Expansion: Piston transmits force to expand brake shoes against drum
- Brake Release: Return springs pull piston back when pressure is released
Failure Symptoms
| 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 feels braked after pedal release | Stuck piston; cylinder fails to return |
| Visible brake fluid leakage at wheel cylinder | Worn/damaged cylinder seals |
| Soft or spongy brake pedal; increased pedal travel | Internal leakage or air in hydraulic system |
Vehicle & Engine Compatibility
Primary Applications:
| Brand | Model | Compatible Engine | Years |
|---|---|---|---|
| ISUZU | NKR | 4BD1, 4HF1 | 1994– |
| ISUZU | NPR | 4BD1, 4HF1 | 1994– |
Extended Applications:
| Brand | Model Series | Compatible Engine |
|---|---|---|
| ISUZU | NQR | 4BD1, 4HF1 |
| ISUZU | ELF | 4BD1, 4HF1 |
| ISUZU | NLR / NMR | 4HF1 |
| ISUZU | NNR | 4HF1 |
| ISUZU | NPR TURBO | 4BD1, 4HF1 |
Left/Right Side Pairing: This product is the Rear Right (RH) brake wheel cylinder. The Rear Left (LH) counterpart is 8971398210 / 8-97139821-0. Please confirm whether left or right side is needed before ordering.
Features & Benefits
1-3/16 Inch Precision Bore (30.16mm)
Provides adequate hydraulic thrust for responsive, reliable braking
Provides adequate hydraulic thrust for responsive, reliable braking
High-Strength Metal Construction
Excellent corrosion resistance and mechanical strength for heavy-duty applications
Excellent corrosion resistance and mechanical strength for heavy-duty applications
Premium Seal Design
Prevents brake fluid leakage and contamination
Prevents brake fluid leakage and contamination
Complete Maintenance Design
Equipped with bleeder screw and adjuster for easy servicing
Equipped with bleeder screw and adjuster for easy servicing
Direct-Fit Design
Manufactured to ISUZU original specifications
Manufactured to ISUZU original specifications
100% Factory Quality Inspection
Every piece undergoes strict quality inspection
Every piece undergoes strict quality inspection
1-Year Warranty
Reliable after-sales protection
Reliable after-sales protection
Broad OEM Cross-Compatibility
Replaces multiple OEM and reference numbers
Replaces multiple OEM and reference numbers
Quality Control
| 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 metal standard |
Important Fitment Warnings
SAFETY NOTICE: The brake wheel cylinder is a critical braking system safety component that directly affects vehicle braking performance and driving safety. Professional installation with specialized tools is strongly recommended.
- Number Confirmation: Verify part number 8-97139822-0 / 8971398220 on original part before ordering
- Installation Position: This is the Rear Right (RH) brake wheel cylinder
- Pair Replacement Recommended: Replace in pairs (left and right) for balanced braking force
- Associated Components: Inspect brake shoes, brake drums, and brake lines during replacement
- Brake Fluid Replacement: Replace brake fluid (DOT 3 or DOT 4) and bleed hydraulic system
- Professional Installation: Critical safety component - professional installation strongly recommended
Packaging & Supply
| Packaging | Neutral packaging or customized per customer request |
| Quantity per package | 1 pc/box (standard shipment packaging) |
| Product Net Weight | 1.23～1.382 kg |
| Brand | IZUMI / NAP / Axcel / OEM Standard |
| Place of Origin | China |
| Minimum Order Quantity | 1 piece |
| Delivery Time | 5–30 working days |
| Warranty | 1 year |
| Target Customers | Truck parts wholesalers, repair shops, fleet purchasers, export traders |
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