Front Brake Wheel Cylinder 1-3/16" Bore High-Strength Cast Iron with 4-Bolt Mounting for ISUZU NKR NPR 4HF1
| Material: | High-Strength Cast Iron | Weight: | 1.00 – 1.15 Kg |
| Piston Quantity: | 1 | Bleeder Screw: | Included, 16 Teeth |
| Mounting Method: | 4-Bolt Mounting | Bore Size: | 1-3/16 Inch (30.163 Mm / 30.2 Mm) |
| Inlet Thread: | 10mm, Inverted Flare | Installation Position: | Front Right Front |
| High Light: | 1-3/16" Bore Brake Wheel Cylinder,High-Strength Cast Iron Wheel Cylinder,4-Bolt Mounting Front Brake Wheel Cylinder |
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The Front Brake Wheel Cylinder with OEM numbers 8-97139820-0 / 8971398200 is a verified direct-fit replacement for ISUZU NKR / NPR / NQR 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.
Mounted on the brake backing plate and connected to the brake master cylinder via brake lines, this wheel cylinder operates by pushing pistons outward when brake fluid flows from the master cylinder. This action forces brake shoes to expand and press against the brake drum, converting kinetic energy into thermal energy through friction. The high-strength cast iron housing with precision-machined pistons and sealing components ensures stable brake pressure transmission and long-term reliable sealing.
- Soft or spongy brake pedal / increased pedal travel — Internal seals are worn, causing brake fluid leakage and system pressure loss
- Brake fluid traces found inside brake drum or on inner tire side — Indicates wheel cylinder seal failure with fluid external leakage
- Reduced braking performance / significantly 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 distribution
- Slow brake pedal return — Return spring failure or piston sticking
| Verification Item | Data | Source |
|---|---|---|
| Bore Size | 1-3/16 inch (30.163 mm / 30.2 mm) | Product Specification |
| Material | High-Strength Cast Iron | Product Specification |
| Piston Quantity | 1 (Single Piston) | Product Specification |
| Mounting Method | 4-Bolt Mounting | Product Specification |
| Inlet Thread | 10mm, Inverted Flare | Product Specification |
| Bleeder Screw | Included, 16 Teeth | Product Specification |
| Weight | ≈ 1.00 – 1.15 kg | PartSouq / Product Specification |
| Installation Position | Front Right Front | Product Specification |
| Warranty | 1 Year / 30,000 km | Supplier Standard |
| Part Number: | 8-97139820-0 8971398200 | Product Name: | Brake Wheel Cylinder |
|---|---|---|---|
| Car Model: | NKR NPR | Engine Model: | 4HF1 |
| Condition: | 100% Brand New | Size: | Standard |
| Weight: | Standard | Origin: | China Mainland |
| Main Market: | Middle East, Asia, Africa, South America, North America & Europe | ||
| Package: | Neutral Packing Or Make It As Requested | ||
| Material: | High-strength aluminum alloy & precision bearings | ||
| Installation: | Direct OEM replacement | Quality Standard: | OEM equivalent / ISO quality control |
Primary Applications:
| Brand | Model | Chassis/Platform | Engine | Years |
|---|---|---|---|---|
| ISUZU | NKR | NKR Series | 4HF1, 4BE1, 4HG1, 4HK1, 4JJ1 | 1994– |
| ISUZU | NPR | NPR Series | 4HF1, 4BE1, 4HG1, 4HK1, 4JJ1 | 1994– |
| ISUZU | NQR | — | 4HF1, 4BE1, 4HG1, 4HK1, 4JJ1 | 1994– |
| ISUZU | NPS | — | 4HF1, 4BE1, 4HG1, 4HK1, 4JJ1 | — |
| ISUZU | ELF | ELF Platform/Chassis(NKR7_, NKS7_, NHR6_, NKR6_) | 4HF1, 4BE1 | 1993–1998 |
| ISUZU | NLR | — | — | 2008– |
| ISUZU | NMR | NMR85 | — | 2008– |
| ISUZU | NNR | — | — | 2008– |
Important Notes:
- This product is for Front Right Front wheel cylinder application
- Please confirm your vehicle's brake system type (Drum Brake / Disc Brake) — 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
Superior pressure resistance and thermal cycle resistance, ensuring stable brake pressure transmission over long-term use, built for the rigors of truck applications— verified by bench pressure testing under maximum brake system operating pressure
Bore diameter precision controlled at 1-3/16" (30.163 mm / 30.2 mm) for perfect piston-to-bore fit, minimizing leakage risk— verified by CMM dimensional inspection
Effectively prevents brake fluid leakage, extending wheel cylinder service life — verified by seal durability testing
Facilitates brake system bleeding to ensure no air bubbles in the brake fluid circuit— complies with ISO standard brake system maintenance specifications
No modifications required — direct bolt-on fitment— confirmed across multiple repair shop installations with high success rate
Every unit undergoes dimensional, visual, and seal integrity inspection before shipment — complies with ISO/TS16949 Quality Management System standards
| QC Item | Verification Method | Standard |
|---|---|---|
| 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 |
| Quality Management System | ISO/TS16949 Certified | Meets international automotive industry quality standards |
IMPORTANT: 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.
- 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 (16 teeth) 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 Item | Interval |
|---|---|
| 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: Plastic bag + Neutral box + Carton / Custom packaging available upon request
- Minimum Order Quantity (MOQ): 1 piece
- Lead Time: 5–30 days (depending on order quantity)
- Payment Terms: T/T, Western Union, L/C
- Target Customers: Wholesalers, distributors, fleet maintenance suppliers, auto parts retailers
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