Front Brake Wheel Cylinder with 1-3/16 inch Bore Cast Iron Construction and 4-Bolt Mounting for ISUZU NKR NPR 4HF1
Price:
Negotiable
MOQ:
20 PCS
Delivery Time:
5-8 Work Days
Brand:
YIMI
Product Description
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 |
| Bore Surface Finish | Surface Roughness Tester - Meets OE drawing requirements |
| Material Hardness | 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
- Connect Brake Line: Reconnect brake line, tighten inlet thread (10mm Inverted Flare)
- Bleed the System: Use the bleeder screw to remove air from the brake system
- Refill Brake Fluid: Fill with DOT 3 or DOT 4 brake fluid to specified level
- Brake Test: After installation, perform brake pedal feel test and road test to confirm normal braking operation
Maintenance Schedule:
| Brake Fluid Inspection / Replacement | Every 2 years or 40,000 km |
| Brake Wheel Cylinder Inspection | During every brake shoe replacement |
| Wheel Cylinder Replacement | Immediately when leakage, sticking, or degraded braking performance is detected |
Packaging & Supply Information
- Packaging: Plastic bag + Neutral box + Carton / Custom packaging available upon request
- Minimum Order Quantity (MOQ): 50-100 pcs
- Lead Time: 1-30 days (depending on order quantity)
- Target Customers: Wholesalers, distributors, fleet maintenance suppliers, auto parts retailers
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Get in Touch
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Company
Yimi (Guangzhou) Automotive Parts Co, Ltd
Location
Unit 1313, Building 5, Changsheng DDP Fashion Center, No. 17 Dachi Road, Tancun, Shijing Subdistrict, Baiyun District, Guangzhou City.
Contact Person
James