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The Hydraulic Brake Booster (BOOSTER; HYDRAULIC BRK) with OEM number 8-98031414-0 — cross-referencing to 8980314140 / 8-97209212-0 / 8972092120 — is a critical safety component of the hydraulic brake system for ISUZU ELF, NPR, NQR, and 700P models equipped with the 4HK1 diesel engine.
Function Overview
The hydraulic brake booster is mounted between the brake pedal and the brake master cylinder. It uses hydraulic pressure supplied by the engine's power steering pump to multiply the force applied by the driver on the brake pedal, then transfers that amplified force to the brake master cylinder. The master cylinder pistons push brake fluid through the brake lines to the wheel brakes at each corner, achieving efficient braking. This component allows the driver to obtain sufficient braking force with reduced pedal effort, making it an indispensable power-assist device in commercial vehicle brake systems.
2025 Verifiable Signal Reinforcement
Weight & Logistics Data: Net weight 9.7 KG per piece, H/S Code: 870830000 — supports accurate freight and customs cost calculation
Installation Fitment: Direct replacement for OEM booster, fits ISUZU ELF/NPR/NQR/700P 4HK1 platforms
Genuine Reference Price: ISUZU genuine part market reference price approximately $1,499–$1,799 USD
Failure Symptoms
Abnormally hard brake pedal requiring excessive force to decelerate or stop
Significantly extended braking distance and delayed brake response
No pedal drop when depressing brake pedal with engine running (typical sign of booster failure)
Slow or incomplete pedal return after releasing the brake pedal
Abnormal air noise or hissing sound from the booster area during braking
Diagnostic method: With the engine off, pump the brake pedal several times to release residual assist, then maintain pedal pressure and start the engine. If the pedal drops noticeably several centimeters after engine start, the booster is working; if there is no drop, the booster has failed.
Product Specifications
Specification
Details
Part Number
8-98031414-0 8980314140
Product Name
Hydraulic Brake Booster
Car Model
700P
Engine Model
4HK1
Condition
100% Brand New
Origin
China Mainland
Main Market
Middle East, Asia, Africa, South America, North America & Europe
⚠️ Important: This is a brake system safety component requiring professional repair qualifications for installation. Please provide VIN or chassis number before ordering for fitment verification. Different NPR/NQR year/config variations may use different brake booster models — cross-reference by OEM number is strongly recommended. Brake system bleeding is mandatory after installation.
Features & Benefits
Hydraulic assist design
Uses power steering hydraulic pressure to multiply pedal force
Direct OEM replacement
Factory mounting holes and hydraulic line connections — no modification required
High pressure and corrosion resistance for severe commercial vehicle conditions
Net weight 9.7 KG
Matches OEM weight; no change to vehicle balance
Genuine cross-reference
CARDONE 538440 direct cross-interchange; globally recognized number
Quality Control & Verification
QC Item
Verification Method
Dimensional inspection
CMM coordinate measurement against OEM drawing for key mounting dimensions and port positions
Housing sealing
Pneumatic/hydraulic seal test confirming no internal or external leakage
Boost ratio test
Bench test confirming boost ratio meets OEM specification
Pedal return test
Simulated condition test of pedal return speed and travel
Material hardness
Housing material hardness testing to ensure pressure resistance
Visual inspection
Visual check for cracks, porosity, corrosion on housing
Packaging inspection
Ensure no deformation or damage in transit
The above QC items are industry-standard recommendations. Actual QC standards should be based on supplier inspection reports. As a safety component, brake boosters from suppliers with bench test reports should be prioritized.
Installation & Maintenance Recommendations
⚠️ IMPORTANT SAFETY NOTICE: The brake booster is a core safety component of the brake system. Installation must be performed by professional technicians with commercial vehicle brake system repair qualifications. Brake system bleeding and road testing are mandatory after installation. Always refer to the ISUZU workshop manual.
Installation Guidelines
Disconnect battery negative terminal for safe operation
Disconnect hydraulic lines from brake master cylinder; plug ports to prevent fluid loss and air ingress
Remove old booster connections to brake pedal and master cylinder
Install new booster, ensuring pushrod length matches OEM specification; connect to brake pedal and master cylinder
Tighten mounting bolts to ISUZU-specified torque (consult workshop manual for specific torque values)
Reconnect hydraulic lines, refill brake fluid, and perform brake system bleeding
Start engine and perform the booster function test described above to confirm normal pedal drop
Conduct low-speed road test to confirm normal braking performance
Maintenance Schedule
Inspect booster appearance, line connections, and leaks at every service interval
Check overall brake system condition including booster function every 40,000–60,000 km or 2 years
Inspect booster immediately if hard pedal, extended braking distance, or abnormal noise occurs
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 ...