Vacuum Power Brake Booster Pump 8-97162798-1 8971627981 For ISUZU 600P 100P-TC NKR NPR 4KH1 4JB1-T — OEM-Grade Aftermarket, ISO/TS16949, Direct Fit Brake Vacuum Pump

The Vacuum Power Brake Booster Pump with OEM references 8-97162798-1 / 8971627981 is a verified direct-fit replacement for ISUZU 600P, 100P-TC, NKR, and NPR light trucks equipped with 4KH1 and 4JB1-T diesel engines. This vacuum pump is a critical component of the brake assist system, responsible for generating the vacuum required by the brake booster to multiply pedal force and reduce braking effort.

The pump operates by continuously evacuating air from the brake booster chamber, creating the pressure differential that allows the booster to amplify driver input. On diesel engines like the 4KH1 and 4JB1-T — which do not produce intake manifold vacuum in the same way as gasoline engines — this mechanical vacuum pump is essential for safe, low-effort braking. Without a functioning vacuum pump, the brake pedal becomes extremely hard and stopping distances increase dramatically.

This unit is supplied as an OEM-grade aftermarket component manufactured under ISO/TS16949 quality management, with a reference net weight of 1.2 kg and HS code 851140100. It is available from multiple aftermarket suppliers including Feimenl Mugol and MAMUR, and is cross-referenced against a broad OE family that includes 8-97162798-0, 8-97162798-AT, 8-97162-798-1, and 8-97162-7980.

• ✓Product Type Verified: Cataloged as "Vacuum Booster Pump" and "Brake Booster Pump" across multiple independent supplier listings for the ISUZU 600P / 4KH1 application.
• ✓Certification Verified: ISO/TS16949, CE, ISO900, EMARK, SASO — confirmed by Feimenl Mugol supplier data.
• ✓Weight & HS Code Verified: Net weight 1.2 kg; HS code 851140100 — confirmed by multiple supplier listings.
• ✓Engine & Vehicle Coverage Verified: Confirmed for ISUZU 600P, 100P-TC, NKR, NPR with 4KH1 and 4JB1-T engines. Additional coverage includes NKR77 (4JH1) and NMR85 / NLR85 (4JH1) per Russian and Hungarian catalog data.
• ✓OE Cross-Reference Density Verified: 8-97162798-1, 8971627981, 8-97162798-0, 8971627980, 8-97162798-AT, 8-97162-798-1, 8-97162-7980, 897162-7980, 897162-7981 are consistently grouped as interchangeable/related references across DEAUTO, PartSouq, QCQicheng, and multiple international suppliers.
• ✓Supply Capacity Verified: 1000 pcs monthly supply capacity and 10–15 day lead time — confirmed by Feimenl Mugol supplier data.
• ✓Warranty Reference: 6–12 months — confirmed by multiple aftermarket supplier listings.
• ⚠Brand Attribution: The "Feimenl Mugol" brand is confirmed in supplier listings as the manufacturer/marketer of this vacuum pump for the ISUZU 600P/4KH1 application. MAMUR is also confirmed as a brand associated with this part family in Japanese and Russian catalogs. Confirm brand preference at inquiry — specifications and quality tiers may vary between suppliers.

• Hard brake pedal / excessive pedal effort: The most direct symptom. A failing vacuum pump cannot generate sufficient vacuum to assist the brake booster, requiring heavy pedal force to stop the vehicle — especially noticeable at low engine speeds or during repeated braking.
• Hissing or air-leak noise from the pump area: A worn pump seal or damaged internal component allows air to escape, producing a persistent hissing or "fsss" sound from the engine bay.
• Longer stopping distance / delayed brake response: Insufficient vacuum assist means the brakes engage later and with less force, extending stopping distances — a critical safety concern for loaded commercial trucks.
• Brake pedal requires pumping to maintain assist: Vacuum leaks or declining pump output cause the assist to fade after the first pedal application, requiring repeated pumping.
• Oil contamination or leakage from the pump: Some vacuum pump designs are engine-oil-lubricated; internal seal failure can cause oil to enter the vacuum chamber or leak externally.
• Whistling or abnormal mechanical noise from the pump: Worn bearings, vanes, or diaphragms inside the pump produce audible mechanical noise that changes with engine speed.

1. 1Confirm the required component first: Verify that the original unit is the vacuum pump, not the brake booster assembly. Compare the physical shape and drive interface.
2. 2Safety first: Park on level ground, engage the parking brake, and chock the wheels. Disconnect the battery negative terminal.
3. 3Disconnect the vacuum line: Remove the vacuum hose from the pump outlet. Note the orientation for reassembly. Plug the line to prevent contamination.
4. 4Remove the drive belt (if belt-driven): Relieve belt tension and remove the drive belt from the pump pulley. Note the belt routing.
5. 5Remove the mounting bolts: Unbolt the pump from the engine block or mounting bracket. Support the pump weight before removing the final bolt.
6. 6Remove the pump: Extract the pump carefully. Inspect the drive interface (pulley, gear, or coupling) for wear or damage.
7. 7Clean the mounting surface: Remove dirt, oil, and old gasket residue from the engine block mounting face. A clean surface is essential for a leak-free seal.
8. 8Install the new pump with a new gasket/O-ring: Seat the new seal (confirm inclusion at inquiry) and position the 8-97162798-1 pump. Insert the mounting bolts and torque to the workshop manual specification.
9. 9Reinstall the drive belt (if applicable): Route the belt according to the recorded diagram and tension to specification.
10. 10Reconnect the vacuum line: Reconnect the vacuum hose to the pump outlet. Ensure the connection is fully seated.
11. 11Test operation: Start the engine and let it idle. Depress the brake pedal several times and verify that assist is present (pedal should be noticeably easier to press). Check for hissing noises that would indicate a vacuum leak.

• Inspect the vacuum hose and connections at every brake service or every 20,000–30,000 km — a cracked hose or loose connection can mimic pump failure.
• Check brake pedal feel during routine driving — a progressively hardening pedal indicates declining vacuum pump output.
• Replace the pump at the first sign of hard pedal, hissing, or abnormal noise — do not "monitor" a known-failing safety component on a commercial vehicle.
• Inspect the drive belt (if belt-driven) for wear and correct tension at every service — a slipping belt reduces pump output.

• Standard packing: Neutral box / wooden case / carton / plastic bag + wooden case + pallet; customer-branded packaging available.
• Package contents: 1 × Vacuum Power Brake Booster Pump. Gasket/O-ring, mounting bolts, and drive belt are not included unless explicitly stated — confirm at inquiry.
• Set options: Pump only / pump + gasket kit — specify at inquiry.
• Suitable for: ISUZU 600P / 100P-TC / NKR / NPR brake system repair shops, light commercial fleet maintenance departments, spare parts distributors, and export wholesalers serving Southeast Asia, the Middle East, Africa, and Latin America.
• Related parts available: Brake booster assembly, vacuum hose, check valve, brake master cylinder, drive belt, and complete ISUZU light truck brake system service kits.