Rear Brake Wheel Cylinder 8-97332227-0 8973322270 8-97139856-0 for ISUZU NPR N-Series 4HG1 4.6L Diesel — OEM 1-5/16" Rear Drum Brake Cylinder
| OEM Part Number: | 8-97332227-0 / 8973322270 / 8-97139856-0 / 8971398560 | Part Name: | Rear Brake Wheel Cylinder / Drum Brake Wheel Cylinder |
| Fitting Position: | Rear Left (Forward & Backward) | Bore Diameter: | 1-5/16" (33.3mm / 1.313 In) |
| Material: | High-Grade Cast Iron | Thread Size: | M10 X 1.0 |
| Mounting Bores Distance: | 37 Mm | Weight: | Approx. 0.54 – 0.543 Kg |
| Bleeder Screw: | Included | Vehicle Compatibility: | ISUZU NPR (1991-2016), N-Series |
| Engine Compatibility: | ISUZU 4HG1, 4BD2, 4HF1 | Condition: | Brand New — 100% Quality Inspected |
| Warranty: | 12 Months | ||
| High Light: | ISUZU NPR brake wheel cylinder,OEM rear drum brake cylinder,4.6L diesel brake cylinder |
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The Rear Brake Wheel Cylinder with OEM numbers 8-97332227-0 (also listed as 8973322270) and 8-97139856-0 (also listed as 8971398560) is a verified direct-fit replacement for ISUZU NPR and compatible N-Series trucks equipped with the 4HG1 diesel engine. Manufactured to OEM standards, this wheel cylinder is a critical component of the rear drum brake system that converts hydraulic pressure into mechanical force for reliable stopping power.
If your rear brake wheel cylinder is failing, you may experience one or more of the following symptoms:
- Brake Fluid Leakage: Visible fluid seeping from the rear wheels or inside the brake drum
- Soft or Spongy Brake Pedal: Pedal feels unusually soft or goes to the floor
- Reduced Braking Performance: Vehicle takes longer to stop or requires increased pedal pressure
- Uneven Braking: Vehicle pulls to one side during braking
- Contaminated Brake Shoes: Brake fluid soaking into the brake shoes, causing reduced friction
| Brand | Model | Chassis / Series | Engine | Years |
|---|---|---|---|---|
| ISUZU | NPR | N-Series | 4BD2 3.9L | 1992-1994 |
| ISUZU | NPR | N-Series | 4HF1 4.3L | 1999-2009 |
| ISUZU | NPR | N-Series | 4HG1 4.6L | 2000-2016 |
| ISUZU | NQR | N-Series | 4HG1 | 1995-2004 |
| ISUZU | NPR | N-Series | 4HG1T (Turbo) | 2000-2016 |
| Feature | Benefit + Verification Signal |
|---|---|
| OEM Specification — ISUZU Genuine Equivalent | Guarantees factory-fit quality and performance — verified by OEM part numbers |
| Precision 1-5/16" (33.3mm) Bore | Delivers consistent hydraulic pressure for reliable braking performance |
| High-Grade Cast Iron Construction | Provides exceptional durability and heat dissipation under demanding conditions |
| EPDM Rubber Cups and Boots | Delivers superior resistance to heat, corrosion, and brake fluid |
| Bleeder Screw Included | Complete replacement solution — no need to purchase additional hardware |
| Direct Bolt-On Fitment | No modifications required — engineered as a direct match for the original cylinder |
| 100% Pressure Tested | Guarantees dependable operation and leak-free performance |
| 100% New — No Core Charge | Guarantees zero wear, immediate braking performance, and full service life |
| QC Item | Verification Method |
|---|---|
| Dimensional Accuracy | Precision inspection to verify 1-5/16" bore diameter, M10 x 1.0 inlet threads, and 37mm mounting hole spacing |
| Material Composition | Cast iron analysis to verify structural integrity and heat dissipation characteristics |
| Bore Surface Test | 100% surface testing to ensure optimum sealing surface for pressure cups |
| Leakage Test | 100% hydraulic pressure test to guarantee zero fluid leakage under operating conditions |
| Rubber Component Test | EPDM material verification for heat and corrosion resistance |
| Durability Cycle Test | 500+ hour fatigue testing to verify long-term reliability |
| Final Assembly Inspection | 100% visual and functional inspection before packaging |
Replacing brake wheel cylinders is a critical safety procedure. It is strongly recommended to replace them in pairs.
Pre-Installation Checklist:
- Safely raise the vehicle and support it on jack stands
- Remove the rear wheels and brake drums to access the wheel cylinders
- CRITICAL: This cylinder is for the Rear Left position — ensure you are ordering the correct side
- Inspect brake shoes, drums, and hardware for wear — replace as necessary
- Use new brake fluid (DOT 3 or DOT 4) from a sealed container
- Critical: Replace wheel cylinders in pairs for balanced braking performance
Installation Guidelines (Reference ISUZU workshop manual):
- Safely raise the vehicle and support it on jack stands
- Remove the rear wheels and brake drums
- Disconnect the brake line from the old wheel cylinder
- Remove the mounting bolts securing the cylinder to the backing plate
- Remove the old cylinder and clean the backing plate thoroughly
- CRITICAL: Install the new cylinder with NEW mounting bolts
- Torque the mounting bolts to manufacturer's specified torque settings
- Reconnect the brake line and torque to specification
- CRITICAL: Bleed the brake system thoroughly to remove all air
- Refill with fresh DOT 3 or DOT 4 brake fluid
- Reinstall the brake drums and wheels
- Test brake pedal feel and braking performance before road test
Maintenance Schedule:
- Inspection: Every 50,000 km / 12 months. Check for fluid leaks, brake pedal feel, and braking performance
- Fluid Replacement: Every 2 years or 40,000 km — replace brake fluid to prevent internal corrosion
- Replacement: Immediately if failure symptoms appear. Replace in pairs for balanced braking
- Packaging: Each brake wheel cylinder is securely packed in protective packaging
- Package Contents: 1 Drum Brake Wheel Cylinder (Bleeder screw included)
- Suitable for: Wholesale distributors, truck parts retailers, commercial vehicle repair shops, and fleet owners
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