OEM 8-97162800-1 Brake Booster with Steel Housing and Direct Bolt-On Fitment for ISUZU NPR75 NKR
| OEM Part Number: | 8-97162800-1 / 8971628001 | Design: | Vacuum-Assisted Hydraulic Booster |
| Housing Material: | Steel With Black-Finished Coating | Engine Compatibility: | 4HK1-TC, 4JJ1 3.0L, 4HE1 4.8L |
| Durability Rating: | 500,000+ Km | Installation Fitment: | 99% Direct Bolt-on |
| Vacuum Seal Test: | 100% Vacuum Pressure Test | Durability Cycle Test: | 500+ Hour Fatigue Testing |
| High Light: | OEM 8-97162800-1 Brake Booster,Steel Housing Brake Booster,Direct Bolt-On Brake Booster |
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The Brake Master Vacuum Assembly (Vacuum Power Brake Booster) with OEM numbers 8-97162800-1 and 8971628001 is a verified direct-fit replacement for ISUZU NPR, NPR75, NKR, NQR, and NRR series trucks. This critical component utilizes engine vacuum to multiply brake pedal force, significantly reducing braking effort while ensuring consistent, responsive pedal feel and improved stopping power for heavy-duty truck safety.
If your brake booster is failing, you may experience one or more of the following symptoms:
- Hard or Stiff Brake Pedal: Brake pedal feels unusually hard and requires excessive force to stop the vehicle
- Increased Stopping Distance: Vehicle takes longer to stop than normal, even with firm pedal pressure
- Hissing Noise: A hissing sound from the brake pedal area when pressed — indicates vacuum leak
- Engine Stalling or Rough Idle: Engine RPM drops or stalls when brake pedal is pressed
- Brake Pedal Slow to Return: Pedal does not return to normal position quickly after release
| Part Number | 8-97162800-1 8971628001 |
| Product Name | Brake Booster |
| Car Model | ISUZU NPR75 NKR |
| Engine Model | ISUZU 4HK1-TC |
| Condition | 100% Brand New |
| Material | High-strength aluminum alloy & precision bearings |
| Cooling Type | Engine coolant circulation |
| Installation | Direct OEM replacement |
| Quality Standard | OEM equivalent / ISO quality control |
Primary Applications:
| Brand | Model | Engine | Years |
|---|---|---|---|
| ISUZU | NPR, NPR75, NPR-HD | 4HK1-TC, 4HE1, 4JJ1 | 1998-2020 |
| ISUZU | NKR | 4HK1-T, 4JH1 | Various |
| ISUZU | NQR | 4HK1-TC, 4HE1 | 2002-2014 |
| ISUZU | NRR | 4JJ1 3.0L, 4HE1 4.8L | 1998-2020 |
| ISUZU | ELF Series | 3.0L / 5.2L Diesel | 2012+ |
Cross-Brand Applications:
| Brand | Model | Years |
|---|---|---|
| Chevrolet | W3500 / W5500 Tiltmaster | 2002-2009 |
| GMC | W3500 / W5500 Forward | 2002-2008 |
| Feature | Benefit + Verification Signal |
|---|---|
| OEM Specification — ISUZU Genuine | Guarantees factory-fit quality and performance — verified by ISUZU OEM part numbers |
| Heavy-Duty Steel Housing Construction | Provides exceptional durability and longevity under demanding conditions |
| Precision-Engineered Vacuum Seal System | Delivers consistent and reliable brake assist function — verified by OEM-spec performance testing |
| Direct Bolt-On Fitment | No modifications required — verified by 99% installation success rate |
| Complete Assembly | Includes mounting hardware and bracket assembly for straightforward installation |
| Wide Vehicle Compatibility | Fits multiple ISUZU models and cross-brand applications |
| 100% New — No Core Charge | Guarantees zero wear, immediate response, and full service life |
| QC Item | Verification Method |
|---|---|
| Dimensional Accuracy | Precision inspection to verify all mounting points match OE blueprint specifications |
| Vacuum Seal Integrity Test | 100% vacuum pressure test to guarantee zero leakage |
| Housing Durability Test | Structural integrity testing of steel housing under extreme conditions |
| Performance Simulation Test | Dynamic testing to verify booster response matches OEM specifications |
| Durability Cycle Test | 500+ hour fatigue testing to verify 500,000+ km service life |
| Final Assembly Inspection | 100% visual and functional inspection before packaging |
Pre-Installation Checklist:
- Inspect the brake master cylinder for leaks or damage — replace if necessary
- Check the vacuum hose for cracks or deterioration
- Ensure the brake pedal pushrod is correctly adjusted
- This is a complete booster assembly — master cylinder is sold separately
Installation Guidelines:
- Disconnect the negative battery terminal
- Remove the brake master cylinder from the old booster
- Disconnect the vacuum hose from the booster
- Remove the mounting nuts securing the booster to the firewall
- Disconnect the brake pedal pushrod from the pedal
- Remove the old booster assembly
- Clean the firewall mounting surface thoroughly
- Install the new booster and torque mounting nuts to manufacturer's specifications
- Connect the brake pedal pushrod and adjust as specified
- Reinstall the brake master cylinder onto the new booster
- Reconnect the vacuum hose securely
- CRITICAL: Bleed the entire brake system after installation
- Test brake pedal feel and check for vacuum leaks before road test
Maintenance Schedule:
- Inspection: Every 50,000 km / 12 months. Check brake pedal feel, listen for hissing noises, and inspect vacuum hose
- Replacement: Immediately if failure symptoms appear
- Note: Early signs include hard brake pedal and increased stopping distance
- Packaging: Each brake booster is securely packed in protective carton with foam inserts
- Shipping Ports: Chongqing, Shenzhen, Shanghai
- Suitable for: Wholesale distributors, truck parts retailers, commercial vehicle repair shops, and fleet owners
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