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Front Brake Wheel Cylinder 8-97139818-0 8971398180 for ISUZU NKR NPR 4HF1 — 1-3/16" Bore Verified OEM Replacement
Product Overview
The Front Brake Wheel Cylinder with OEM numbers 8-97139818-0 / 8971398180 is a verified direct-fit replacement for ISUZU NKR / NPR series light-duty trucks equipped with the 4HF1 engine. This critical component of the drum brake system converts hydraulic pressure from the brake master cylinder into mechanical force to push brake shoes against the brake drum, enabling vehicle deceleration and stopping.
Working Principle
Mounted on the brake backing plate and connected to the brake master cylinder via brake lines, this wheel cylinder features a cast iron body with precision-machined pistons and sealing components. When the brake pedal is pressed, brake fluid flows into the cylinder, pushing pistons outward to expand brake shoes against the drum surface, converting kinetic energy into thermal energy through friction.
Failure Symptoms
Soft or spongy brake pedal / increased pedal travel - Internal seal wear causing brake fluid leakage and system pressure loss
Brake fluid traces inside brake drum or on inner tire side - Indicates wheel cylinder seal failure with external leakage
Reduced braking performance / longer stopping distance - Piston sticking or seal failure resulting in insufficient braking force
Vehicle pulls to one side during braking - Single-side wheel cylinder failure causing uneven braking force
Slow brake pedal return - Return spring failure or piston sticking
Technical Specifications
Bore Size
1-3/16 inch (30.163 mm)
Material
Cast Iron
Piston Quantity
1 (Single Piston)
Bleeder Screw
Included
Mounting Method
4-Bolt Mounting
Inlet Thread
10mm, Inverted Flare
Weight
≈ 1.09 kg
Warranty
1 Year / 30,000 km
Vehicle Compatibility
Brand
Model
Chassis/Platform
Engine
Years
ISUZU
ELF250 (NKR)
NKR7_ / NKR6_
4HF1
1994-1998
ISUZU
ELF350 (NPR)
NPR_6 / NPR7_
4HF1
1994-1997
ISUZU
NPR / NQR
--
4HF1, 4BD1
1992-1999
ISUZU
ELF (NKR/NPR)
NKR7_, NKS7_, NHR6_, NPR_6
4.3 TD
1992-1999
ISUZU
ELF (NKR/NPR)
NKR7_, NKS7_, NHR6_, NPR_6
3.1 TD
1998-2001
Chevrolet
W4500 Tiltmaster
--
--
1992-1993
GMC
W4500 Forward
--
--
1992-1993
Important Application Notes:
This product is for Front Wheel application (Front Right / Front position)
Confirm your vehicle's brake system type - this product is only for Drum Brake Systems
Replace in pairs (both left and right wheels) to ensure balanced braking force
Recommend inspecting brake shoes, brake drums, and brake fluid condition during replacement
Features & Benefits
Precision Cast Iron Construction
Superior pressure resistance and deformation resistance, ensuring stable brake pressure transmission over long-term use - verified by bench pressure testing under maximum brake system operating pressure
Precision-Machined Bore
Bore diameter precision controlled at 1-3/16" (30.163 mm) for perfect piston-to-bore fit, minimizing leakage risk - verified by CMM dimensional inspection
High-Quality Seals
Effectively prevents brake fluid leakage, extending wheel cylinder service life - verified by 500-hour seal durability testing with zero leakage
Integrated Bleeder Screw
Facilitates brake system bleeding to ensure no air bubbles in the brake fluid circuit - complies with ISO standard brake system maintenance specifications
Direct OE Replacement Design
No modifications required - direct bolt-on fitment - confirmed across multiple repair shop installations with high success rate
100% Quality Inspected
Every unit undergoes dimensional, visual, and seal integrity inspection before shipment - complies with ISO 9001 Quality Management System standards
Quality Control Standards
Body Dimensional Accuracy
CMM (Coordinate Measuring Machine) - Within OE specification tolerances
Rockwell Hardness Test (HRB) - Meets cast iron material standards
Seal Integrity
Air Tightness / Hydraulic Leak Test - 100% pass, zero leakage
Bleeder Screw Function
Functional Test - Smooth operation, reliable sealing
Visual Inspection
Visual + Gauge Inspection - No casting defects, burrs, or corrosion
Assembly Completeness
100% Inspection - All seals, dust boots, pistons correctly installed
Installation Guidelines
IMPORTANT SAFETY NOTICE: The brake system is a critical safety component. Installation and repair should be performed by qualified professionals following the vehicle's original factory service manual.
Reference Installation Steps:
Safety Preparation: Raise and securely support the vehicle, remove front wheels
Remove Brake Drum: Remove the brake drum, inspect brake shoes and drum for wear
Disconnect Brake Line: Use proper wrench to disconnect the brake line from the wheel cylinder, prevent excessive fluid loss
Remove Old Wheel Cylinder: Remove the 4 mounting bolts and take off the old cylinder
Install New Wheel Cylinder: Clean mounting surface, install new cylinder and tighten mounting bolts to specified torque
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 ...
