Brake Master Vacuum Assembly 8-97162800-1 8971628001 For ISUZU NKR NPR N900 K600 4HF1 4HG1 — OEM Direct Fit Vacuum Brake Booster, Verified Replacement

OEM Direct Fit Vacuum Brake Booster for ISUZU NKR NPR N900 K600 4HF1 4HG1 — Verified Replacement

The Brake Master Vacuum Assembly with OEM numbers 8-97162800-1 / 8971628001 is a verified direct-fit vacuum brake booster for ISUZU NKR, NPR, N900, and K600 series trucks equipped with 4HF1 / 4HG1 diesel engines. This integrated unit combines the brake master cylinder and vacuum booster to amplify pedal force using engine vacuum, ensuring sufficient hydraulic pressure for effective braking in medium-duty commercial trucks.

• OEM Cross-Reference Verified: Replaces 8-97162800-1, 8971628001, 8-97162800-0, 8971628000, 8-97162800-2, 8971628002, 8-97162800-9, 8971628009
• Engine Compatibility Verified: Compatible with 4HF1, 4HG1, 4KH1, 4JH1, 4HK1, and 4HJ1 diesel engines
• Vehicle Application Verified: Designed for ISUZU NKR, NPR, N900, K600, 700P, NQR71, and NQR75 truck models
• Quality Assurance: Brand new — 100% quality inspected with 12-month warranty

• Hard brake pedal: Increased effort required to depress pedal
• Brake booster warning light illuminated: Dashboard alarm with buzzer
• Soft or fading brake pedal: Spongy feel or sinking to floor
• Excessive stopping distance: Longer stopping distance despite normal pressure
• Hissing noise under dashboard: Audible vacuum leak during braking
• Intermittent brake assist loss: Assist fades after 2-3 pedal applications

Each unit undergoes 100% quality inspection before shipment, ensuring reliable performance and safety compliance for commercial vehicle braking systems.

1. Disconnect battery and drain brake fluid from master cylinder reservoir
2. Remove vacuum hose from booster check valve; inspect for damage
3. Disconnect brake lines from master cylinder; plug lines to prevent contamination
4. Remove mounting bolts securing booster to firewall or pedal bracket
5. Remove clevis pin connecting booster push rod to brake pedal
6. Install new assembly: Position, secure mounting bolts, connect brake lines, attach push rod clevis
7. Bleed brake system: Engine must be running during bleeding
8. Check vacuum hose: Ensure secure connection between booster and engine vacuum source
9. Test brakes: Verify pedal feel, warning light operation, and stopping performance

• Inspect vacuum hose and check valve every 40,000-50,000 km or annually
• Replace brake fluid every 2 years or per manufacturer specification
• Inspect booster and vacuum system immediately if warning light illuminates or pedal feels abnormal
• When replacing booster, inspect vacuum pump and check valve for wear

• Standard packing: Protective foam and corrugated carton; wooden pallet available for bulk orders
• Package contents: 1 × Brake Master Vacuum Assembly
• Suitable for: Brake system repair shops, fleet maintenance, spare parts distributors
• Related parts available: Vacuum pump, brake master cylinder repair kit, brake fluid, vacuum hose and check valve

Recommended Replacement Interval: When replacing the brake booster, always inspect the vacuum pump and check valve. Consider replacing the vacuum hose and check valve simultaneously to ensure full system integrity.