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Verified OEM Direct-Fit for J08C Diesel Engine Air Brake System
Product Overview
This Brake Air Booster is a verified direct-fit replacement for HINO 500 series trucks, with OEM numbers 44640-3561 / 446403561. The booster is a critical component of the air brake system, installed on the brake chamber to amplify brake pedal pressure signals and drive the brake chamber push rod to generate sufficient braking force.
Designed for HINO 500 series equipped with J08C diesel engines, it offers bolt-on fitment without modification.
Working Principle
The air brake booster is a power-assist device in the braking system. Its core function is to amplify the air pressure signal generated when the driver depresses the brake pedal. Inside the booster, a diaphragm and valve assembly proportionally magnifies the control pressure from the brake master valve and delivers it to the brake chamber, pushing the push rod to press the brake shoes against the drum for braking.
The booster typically features a dual-circuit design, ensuring basic braking capability even if one circuit fails.
Failure Symptoms
Brake pedal feels hard or spongy; slow return after release
Delayed brake response; braking force output lags behind pedal input
Vehicle pulls to one side or brakes unevenly
Audible air leak (hissing sound) near the booster area
Brake chamber fails to respond quickly to pedal commands; stopping distance increases significantly
These symptoms indicate that the booster's internal diaphragm, seals, or valve body have worn or failed. Prompt replacement is required to prevent further brake system degradation.
Quality Verification
Material Verified: Booster housing manufactured from steel, meeting OEM strength requirements
JIS Salt Spray Tested: Passed JIS standard 1,000-hour salt spray test (exceeding ISO 9227 standard)
Dimensions & Weight Verified: Package size 60*20*20cm, unit weight 10kg
ISO Certified: Product manufactured under ISO and TS 16949 quality systems
Technical Specifications
Part Number
44640-3561 446403561
Product Name
Brake Air Booster
Car Model
HINO 500
Engine Model
J08C
Condition
100% Brand New
Material
High-strength aluminum alloy & precision bearings
Vehicle Compatibility
Brand
Model
Engine
Application
HINO
500 Series
J08C Diesel
Brake Air Booster
HINO
Ranger
J08C
Brake System
Important Notes:
This is a brake air booster installed on the brake chamber; it works in conjunction with the brake chamber assembly
Provide chassis number or VIN before ordering to confirm exact match with 44640-3561
Some HINO 500 variants across different production years may use different booster versions
Confirm the booster-to-chamber connection port specification matches during installation
Features & Benefits
Steel Housing Construction
Withstands high-pressure pneumatic loads with structural integrity
JIS 1,000-Hour Salt Spray Test
Superior corrosion resistance vs. industry standard
OE-Matched Dimensions
Bolt-on installation without modification
Dual-Circuit Safety Design
Maintains basic braking if one circuit fails
ISO/TS 16949 Certified
Consistent batch quality assured
In-Stock Availability
Reduced downtime for repairs
Quality Control Standards
QC Item
Verification Method / Standard
Housing Material
Spectrometer verification of steel composition
Seal Performance
Pneumatic seal test to verify diaphragm and valve body leak-free
Working Pressure Test
Tested at 90-100 psi (≈6.2-6.9 bar) for booster response
Salt Spray Corrosion
JIS standard 1,000-hour salt spray test
Dimensional Inspection
Caliper / dedicated gauge for mounting interface
Appearance & Marking
Visual inspection, OEM number clearly marked
Outgoing Sampling
Batch sampling per AQL standard
Installation & Maintenance
Critical Safety Advisory: Brake booster replacement involves a core component of the pneumatic braking system and must be performed by a qualified technician. Before installation, ensure system air pressure is fully released to avoid high-pressure injury.
Installation Guidelines
Apply parking brake, shut off engine, and release compressed air from the system
Disconnect the air lines connected to the booster; mark line positions
Remove mounting bolts, take out the old booster, and clean the mounting surface
Install the new booster, ensure the gasket is intact, and tighten mounting bolts to specified torque
Reconnect the air lines, ensuring fittings are secure and leak-free
Start the engine, charge system air pressure to normal operating level (90-100 psi)
Perform a brake pedal response test; confirm normal brake response with no delay
Maintenance Schedule
Every 5,000 km: Check brake system air pressure and inspect booster area for signs of leakage
Every 20,000 km: Inspect booster appearance and seal condition; test brake pedal response
Every 40,000 km: Full brake system inspection including booster, brake chambers, and air lines
If brake response slows, pedal feels abnormal, or hissing is heard, inspect the booster immediately
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 ...
