Brake Master Vac Assembly 8-97162798-1 For ISUZU NKR77 4JH1 8971627981 Brake Parts

Premium-quality integrated brake master cylinder and vacuum booster assembly designed specifically for ISUZU NKR77 trucks with 4JH1 diesel engines.

The Brake Master Vac Assembly / Brake Master Cylinder with Vacuum Booster (OEM Numbers: 8-97162798-1 / 8971627981) is a precision-engineered replacement component that combines the brake master cylinder and vacuum booster into a single unit. This assembly amplifies driver pedal force using engine vacuum to deliver powerful, responsive braking performance with minimal pedal effort.

• OE Quality: Manufactured to strict ISUZU dimensional and performance specifications
• Integrated Design: Combines master cylinder and vacuum booster in ready-to-install assembly
• Powerful Brake Assist: Amplifies driver pedal force for responsive, confident braking
• Durable Construction: Corrosion-resistant housing and high-quality internal components
• Leak-Proof Design: Precision seals prevent brake fluid leakage
• Direct Replacement: Complete assembly simplifies installation
• Regulatory Compliance: Meets commercial vehicle safety standards
• Long Service Life: Engineered for reliability in demanding applications

This brake master vac assembly is specifically designed for ISUZU light to medium-duty trucks:

• ISUZU NKR77 – Light to Medium-Duty Trucks
• ISUZU NHR – Light-Duty Trucks (select models)
• ISUZU NPR (select models with 4JH1 engine)
• ISUZU ELF (select models with 4JH1 engine)

• 4-Cylinder, Inline Diesel
• Displacement: 3.0L (2999cc)
• Turbocharged, Intercooled
• Valvetrain: DOHC
• Widely used in NKR77 and various medium-duty trucks

1. Disconnect battery – Disconnect the negative battery cable before beginning work
2. Depressurize the brake system – Pump the brake pedal several times to release vacuum pressure
3. Drain brake fluid – Drain the brake fluid from the master cylinder reservoir
4. Disconnect brake lines – Carefully disconnect the brake lines from the master cylinder
5. Disconnect vacuum hose – Disconnect the vacuum supply hose from the booster
6. Remove the old assembly – Unbolt and remove the brake master vac assembly from the firewall
7. Inspect the brake pedal linkage – Check the push rod and pedal linkage for wear or damage
8. Inspect vacuum hose – Check the vacuum supply hose for cracks or damage; replace if necessary
9. Check the check valve – Verify the one-way check valve functions properly
10. Clean mounting area – Clean the firewall mounting surface and surrounding area
11. Prepare the new assembly – Inspect the new assembly and verify it matches the original
12. Adjust push rod length – Adjust the push rod length to match the original assembly (if adjustable)
13. Install the new assembly – Position the new assembly on the firewall and secure with mounting bolts
14. Torque to specification – Tighten mounting nuts to manufacturer specification
15. Reconnect vacuum hose – Reconnect the vacuum supply hose to the booster
16. Reconnect brake lines – Reconnect the brake lines to the master cylinder
17. Reconnect battery – Reconnect the negative battery cable
18. Fill with brake fluid – Fill the master cylinder reservoir with the recommended brake fluid
19. Bleed the brake system – Bleed the entire brake system to remove all air
20. Test operation – Start the engine and test brake pedal feel and booster operation
21. Check for leaks – Inspect all connections for vacuum or brake fluid leaks
22. Road test – Test drive the vehicle to verify proper braking performance

• Material Verification: Confirms housing, diaphragm, and seal materials meet OE specifications
• Dimensional Inspection: Mounting points, push rod length, and master cylinder bore verified against OEM tolerances
• Vacuum Integrity Testing: 100% tested for vacuum retention and leak-free operation
• Hydraulic Pressure Testing: Master cylinder pressure and seal integrity verified
• Diaphragm Integrity Testing: Diaphragm flexibility and durability verified
• Performance Testing: Boost ratio and hydraulic output verified under simulated operating conditions
• Corrosion Testing: Housing treated for corrosion resistance in demanding environments
• Visual Inspection: 100% checked for defects, machining flaws, or damage
• Packaged Safely: Protected and securely packaged to prevent damage and contamination

• Neutral export packing or customized packaging available
• Carton or wooden case for safe transportation
• Fast delivery for stock items
• Shipping by Express Air or Sea

For pricing, availability, or bulk purchase of the Brake Master Vac Assembly 8-97162798-1 For ISUZU NKR77 4JH1 8971627981 Brake Parts, please contact our sales team for a competitive quote and expert technical support.