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OEM Direct Fit Vacuum Brake Booster for ISUZU NKR NPR N900 K600 4HF1 4HG1 — Verified Replacement
Product Overview
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.
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
Failure Symptoms — When to Replace
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
Part Number
8-97162800-1 8971628001
Product Name
Brake Master Vacuum Assembly
Car Model
ISUZU NKR NPR N900 K600
Engine Model
ISUZU 4HF1 4HG1
Condition
100% Brand New
Origin
China Mainland
Vehicle & Engine Compatibility
Brand
Model / Series
Engine
Years
ISUZU
NKR
4HF1 / 4HG1
1999+
ISUZU
NPR
4HF1 / 4HG1
1999+
ISUZU
N900
4HF1
—
ISUZU
K600
4HF1 / 4HG1
—
ISUZU
700P
4HK1-TC / 4HF1
—
ISUZU
NQR71
4HF1
—
ISUZU
NQR75
4HF1 / 4HK1
—
Important Fitment Notes: Confirm engine variant (4HF1 vs. 4HG1), verify OEM number against engine tag, and ensure engine is running during brake bleeding. This assembly includes both vacuum booster and master cylinder as a combined unit.
OEM-grade vacuum diaphragm
Provides consistent brake assist across full pedal travel range
Multi-engine platform compatibility
One part covers multiple engine types, reducing inventory complexity
Direct-fit replacement
Bolt-on installation without modification
Cross-brand compatibility
Also fits Chevrolet Tiltmaster and GMC Forward models
12-month warranty
Comprehensive warranty against manufacturing defects
Quality Control & Verification
QC Item
Verification Method
Vacuum diaphragm integrity
Vacuum leak-down pressure test
Master cylinder bore dimension
Precision bore gauge inspection
Internal seal condition
Visual and pressure inspection
Housing weld integrity
Visual and leak test
Push rod travel
Dimensional verification
Assembly function test
Bench simulation of pedal force amplification
Final inspection
100% quality inspection before packaging
Each unit undergoes 100% quality inspection before shipment, ensuring reliable performance and safety compliance for commercial vehicle braking systems.
Installation & Maintenance
IMPORTANT: Brake system service requires professional expertise. Always refer to the ISUZU workshop manual. Improper installation can result in brake failure and serious injury. Air in the brake hydraulic circuit reduces braking efficiency.
Installation Guidelines
Disconnect battery and drain brake fluid from master cylinder reservoir
Remove vacuum hose from booster check valve; inspect for damage
Disconnect brake lines from master cylinder; plug lines to prevent contamination
Remove mounting bolts securing booster to firewall or pedal bracket
Remove clevis pin connecting booster push rod to brake pedal
Install new assembly: Position, secure mounting bolts, connect brake lines, attach push rod clevis
Bleed brake system: Engine must be running during bleeding
Check vacuum hose: Ensure secure connection between booster and engine vacuum source
Test brakes: Verify pedal feel, warning light operation, and stopping performance
Maintenance Schedule
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
Packaging & Supply
Standard packing: Protective foam and corrugated carton; wooden pallet available for bulk orders
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.
Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ... Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ...