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ISUZU Brake Wheel Cylinder 8-97139841-0 8971398410 for NKR 4JB1 — 1 Inch 16T Rear Right OEM Standard
Product Overview
The ISUZU Brake Wheel Cylinder with OEM numbers 8-97139841-0 / 8971398410 is a precision-engineered replacement designed for ISUZU NKR, NLR, and ELF series light-duty trucks, compatible with 4JB1, 4JH1, 4JG1, 4JJ1, and 4HG1 diesel engines. This component is a core actuation element of the vehicle's hydraulic braking system — the Rear Right Brake Wheel Cylinder Assembly — responsible for converting hydraulic pressure from the master cylinder into mechanical force to push the brake shoes against the brake drum.
Numbering Note: This product number is 8-97139841-0 / 8971398410. Cross-reference numbers include 8-97078683-0 / 8970786830, 8-94128142-1 / 8941281421, 8-94128142-2 / 8941281422, and 8-94128142-3 / 8941281423. The JMC (Jiangling Motors) reference number is 3502310A1. Please verify the specific number and installation position based on actual vehicle configuration.
Working Principle
The brake wheel cylinder is a critical actuation component of the hydraulic braking system, mounted on the brake backing plate and connected to the master cylinder via brake fluid lines.
Hydraulic Input: When the driver depresses the brake pedal, the master cylinder converts pedal force into hydraulic pressure transmitted through the brake fluid lines.
Piston Actuation: Hydraulic pressure pushes the piston inside the wheel cylinder outward.
Brake Shoe Expansion: The piston transmits force through the push rod to the brake shoes, expanding them against the rotating brake drum to generate friction for deceleration.
Brake Release: When the driver releases the brake pedal, hydraulic pressure is released and return springs pull the piston back, separating the brake shoes from the drum.
Failure Symptoms
Inspect immediately if any of these symptoms occur:
Number Confirmation: This product number is 8-97139841-0 / 8971398410. Cross-reference numbers include 8-97078683-0 / 8970786830, 8-94128142-1/2/3 / 8941281421/1422/1423, and 3502310A1 (JMC). Verify the specific number on the original part before ordering.
Installation Position: This is the Rear Right (RH) brake wheel cylinder. Confirm whether the left or right side is needed.
Pair Replacement Recommended: Brake wheel cylinders should be replaced in pairs (left and right) to ensure balanced braking force.
Associated Components: When replacing the wheel cylinder, it is recommended to inspect brake shoes, brake drums, and brake lines — replace if necessary.
Brake Fluid Replacement: Replace brake fluid (DOT 3 or DOT 4) and bleed the hydraulic system when replacing the wheel cylinder.
Professional Installation: The brake wheel cylinder is a critical braking system safety component — professional installation is strongly recommended.
Features & Benefits
1 Inch Precision Bore (25.4mm)
Provides adequate hydraulic thrust for responsive, reliable braking
Heavy-Duty Cast Iron Construction
Excellent corrosion resistance and mechanical strength for long-term reliable operation
Two-Level Mounting Step Design
Ensures secure and reliable installation on the brake backing plate
Pre-Assembled High-Quality Seals
Effectively prevents brake fluid leakage and contamination
Standard Bleeder Screw
Facilitates brake system bleeding for stable braking performance
ISO/TS16949 Quality Management Certified
Internationally recognized automotive industry quality standard
Direct-Fit Design
Manufactured to ISUZU original specifiions — no modifiions needed
Quality Control
QC Item
Inspection Method
Acceptance Criterion
Cylinder bore size
Bore gauge / CMM
1 inch (25.4mm) ± tolerance
Piston-to-bore clearance
Special gauges
Standard range
Seal integrity
Visual + dimensional inspection
No damage, no deformation
Hydraulic seal test
Pressure test bench
No leakage; stable pressure retention
Material composition
Spectrometer
Per cast iron standard
Gear precision
Special gear inspection equipment
16-tooth standard specifiion
Installation & Maintenance
IMPORTANT SAFETY NOTICE: The brake wheel cylinder is a critical braking system safety component that directly affects vehicle braking performance and driving safety. Professional installation with specialized tools is strongly recommended.
Installation Guidelines
Confirm installation position (Rear Right) and part number (8-97139841-0)
Prepare tools: Socket wrench, brake line wrench, torque wrench, brake fluid (DOT 3 or DOT 4)
Park vehicle on level surface, engage parking brake, and securely support with jack stands
Remove the relevant wheel to access the brake assembly
Disconnect the brake fluid line from the old cylinder using a brake line wrench
Remove bolts or fasteners securing the old cylinder
Clean mounting surface thoroughly before installing new cylinder
Reconnect brake fluid line and ensure tight, leak-free connection
Fill master cylinder reservoir with DOT 3 or DOT 4 brake fluid
Bleed brake system using bleeder screw until brake pedal feels firm
Maintenance Schedule
Item
Interval
Notes
Brake fluid inspection
Every 10,000 km / each service
Check fluid level and color; brake fluid should be clear
Wheel cylinder & line leak check
Every 20,000 km
Check for brake fluid seepage
Brake fluid replacement
Every 2 years / 40,000 km
Brake fluid absorbs moisture; long-term use degrades performance
Wheel cylinder inspection
Upon symptom occurrence
Inspect/repair/replace if leakage or sticking detected
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 ...
