Rear Brake Wheel Cylinder 8-97358879-0 8973588790 For ISUZU NPR NQR NRR N-Series 4HK1-T — OEM Verified Direct Fit, 1-5/16" Bore Cast Iron, Rear Right
| OEM Part Number: | 8-97358879-0 / 8973588790 | Part Name: | Rear Brake Wheel Cylinder (Drum Brake) |
| Engine Compatibility: | ISUZU 4HK1-T (5.2L Turbo Diesel); Also Compatible With 4JJ1 3.0L, 4HG1-T | Vehicle Models: | ISUZU NPR, NQR, NRR, N-Series (2004–2016); ISUZU NPR75, NQR71, NQR75, 700P; Chevrolet/GMC W-Series (2004–2010); Chevrolet Low Cab Forward (2016–2017) |
| Position: | Rear Right (Passenger Side) | Bore Diameter: | 33.34 Mm (1-5/16 In / 1.313 In) |
| Material: | Grey Cast Iron | Inlet Thread: | (2) M10 × 1.0 |
| Bleeder Screw: | Not Included (bleeder Screw Cap Also Not Included) | Rubber Components: | EPDM Cups And Boots |
| Brake Fluid Compatibility: | DOT 3 / DOT 4 | Condition: | Brand New — 100% Pressure Tested |
| Warranty: | 12 Months | Weight: | 1.530–1.536 Kg (Blue Print Specification) |
| High Light: | ISUZU NPR rear brake wheel cylinder,OEM verified ISUZU N-Series brake cylinder,cast iron rear right wheel cylinder |
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The Rear Brake Wheel Cylinder with OEM numbers 8-97358879-0 / 8973588790 is a verified direct-fit replacement for ISUZU NPR, NQR, NRR, and N-Series trucks equipped with the 4HK1-T diesel engine. This critical hydraulic component converts hydraulic pressure from the master cylinder into mechanical force that pushes brake shoes against the drum to slow or stop the vehicle.
| Part Number | 8-97358879-0 8973588790 |
| Product Name | Brake Wheel Cylinder |
| Car Model | ISUZU NPR NQR NRR N-Series |
| Engine Model | ISUZU 4HK1-T |
| Bore Diameter | 33.34 mm (1-5/16") |
| Material | Grey Cast Iron |
| Position | Rear Right (Passenger Side) |
| Thread Specification | (2) M10 × 1.0 inlet threads |
| Condition | 100% Brand New |
- Brake fluid leak at wheel: Visible wetness around backing plate or inside brake drum
- Spongy or long-travel brake pedal: Pedal sinks further than normal and feels soft
- Uneven braking or vehicle pull: Vehicle pulls to one side during braking
- Brake fade or overheating drums: Extended stopping distances and hot brake drums
- Brake warning light illumination: Dashboard brake warning activates
| Brand | Model / Series | Engine | Years |
|---|---|---|---|
| ISUZU | N-Series | 4HK1-T | 2004-2016 |
| ISUZU | NPR | 4HK1-T | 2004-2016 |
| ISUZU | NQR | 4HK1-T | 2004-2016 |
| ISUZU | NRR | 4HK1-T | 2004-2016 |
| ISUZU | 700P | 4HK1-T | 2004-2016 |
| Chevrolet | W-Series | 4HK1-T | 2004-2010 |
| GMC | W-Series | 4HK1-T | 2004-2010 |
Ensures consistent hydraulic pressure and even brake shoe actuation
Provides structural rigidity and heat resistance under sustained braking loads
Superior resistance to heat, corrosion, and brake fluid degradation
Each unit individually tested before packaging for leak-free performance
Direct bolt-on replacement without modification
Works with standard brake fluid specifications
| QC Item | Verification Method |
|---|---|
| Bore diameter / roundness | Precision bore gauge inspection (33.34 mm) |
| Piston fitment | Go/no-go gauge verification |
| Housing material | Spectrometer analysis (grey cast iron composition) |
| Rubber cup integrity | Visual and dimensional inspection (EPDM) |
| Pressure integrity | 100% hydrostatic pressure test |
| Thread specification | Thread gauge inspection (M10 × 1.0) |
Each unit undergoes 100% pressure testing before packaging. Manufacturing conforms to OEM specification standards for hydraulic brake components.
- Safety first: Park on level ground, engage parking brake, and chock front wheels
- Remove wheel and drum: Loosen lug nuts, raise vehicle, remove wheel and brake drum
- Disconnect hydraulic line: Place drain pan underneath, disconnect brake line and plug to prevent contamination
- Remove old cylinder: Unbolt wheel cylinder from backing plate
- Clean mounting surface: Remove rust, dirt, and debris from backing plate
- Install new cylinder: Position new wheel cylinder and tighten mounting bolts to specification
- Reconnect brake line: Connect hydraulic line to inlet port using M10 × 1.0 thread specification
- Install shoes and drum: Reinstall brake shoes, adjuster components, and drum
- Bleed brake system: Fill master cylinder and bleed system until clear, bubble-free fluid flows
- Test brakes: Pump pedal to seat shoes, check for leaks, and road-test at low speed
- Inspect wheel cylinders every 40,000-50,000 km or during any brake service
- Replace wheel cylinders in axle pairs to ensure balanced braking performance
- Flush brake fluid every 2 years or according to manufacturer interval
- Inspect backing plate for brake fluid wetness at every oil change
- Standard packing: Individual box with protective packaging
- Package contents: 1 × Rear Brake Wheel Cylinder (bleeder screw not included)
- Set options: Right side only, or left + right pair available
- Suitable for: Brake system repair shops, fleet maintenance, spare parts distributors
- Related parts available: Rear left wheel cylinder (8-97358878-0), brake shoes, drums, and hardware kits
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