SC-80423 Brake Wheel Cylinder Rubber Cup 1 Inch NBR Wheel Cylinder Cup Seal for ISUZU NKR 100P NPR
| Material: | NBR (Nitrile Butadiene Rubber) | Size: | 1 Inch |
| Position: | Rear Wheel Cylinder | Reference Code: | SC-80423 |
| Bag Quantity: | 200 PCS | Production Date: | 2025-02-12 |
| Fluid Resistance: | DOT 3 / DOT 4 | Hardness: | Shore A |
| High Light: | SC-80423 Brake Wheel Cylinder Rubber Cup,1 Inch Wheel Cylinder Cup Seal,NBR Brake Cylinder Cup |
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Brake Wheel Cylinder Rubber Cup SC-80423 for ISUZU NKR 100P / NPR — Verified OEM-Fit Rear Wheel Cylinder Cup Seal, 1 Inch
The Brake Wheel Cylinder Rubber Cup with reference code SC-80423 is a verified direct-fit replacement for ISUZU NKR 100P / NPR light trucks. This rubber cup is a critical component of the rear drum brake hydraulic system, responsible for sealing hydraulic pressure inside the wheel cylinder and ensuring reliable braking force transmission.
The brake wheel cylinder rubber cup is the primary hydraulic seal inside the wheel cylinder. It converts hydraulic brake fluid pressure into mechanical force that pushes the brake shoes against the brake drum. The cup-shaped design features a precisely angled sealing lip that expands under hydraulic pressure — the tighter the braking force, the tighter the seal.
This rubber cup is manufactured by Jingzhong (贵州精忠橡塑实业有限公司), a professional rubber and plastic manufacturer with ISO/TS 16949:2009 quality system certification, using an NBR (Nitrile Butadiene Rubber) compound for excellent resistance to DOT 3 / DOT 4 brake fluid, heat, and compression set.
Replace the brake wheel cylinder rubber cup when any of these symptoms appear:
- Brake fluid seepage past the dust boot — visible fluid traces on the backing plate or inside the drum.
- Spongy or sinking brake pedal — internal fluid bypass caused by worn or hardened cup seals reduces hydraulic pressure.
- Uneven or reduced braking effectiveness — the vehicle pulls to one side during braking, or stopping distance increases.
- Brake fluid contamination — degraded rubber particles from worn cups contaminate the brake fluid, accelerating wear on other hydraulic components.
⚠️ Critical Inspection Note: ISUZU service manuals require that when rebuilding a wheel cylinder, both cup seals and dust boots must be replaced as a complete set per wheel. Prior to installation, the cylinder bore must be inspected for scoring or pitting — if damaged, the entire wheel cylinder assembly must be replaced. New cups must be lubricated with clean brake fluid and installed with the sealing lip facing the hydraulic pressure source.
| Verification Item | Data / Standard | Source / Method |
|---|---|---|
| Reference Code | SC-80423 | Product image (package label) |
| Part Name | Brake Wheel Cylinder Rubber Cup (Rear) | Product listing |
| Brand | YIMI AUTOPARTS | Product image |
| Manufacturer | Jingzhong (贵州精忠橡塑实业有限公司) | Product image (package label) |
| Vehicle Models | ISUZU NKR 100P / NPR | Isuzu-truckspares; Autopart Masters |
| Position | Rear Wheel Cylinder | Product listing |
| Size | 1 Inch | Product listing |
| Material | NBR (Nitrile Butadiene Rubber) | Product specification |
| Certification | ISO/TS 16949:2009 | Product image (package label) |
| Bag Quantity | 200 PCS | Product image (package label) |
| Production Date | 2025-02-12 | Product image (package label) |
| Warranty | 1 Year | Product listing |
SC-80423 Brake Wheel Cylinder Rubber Cup — package label detail
| Part Number: | SC-80423 | Product Name: | Brake Wheel Cylinder Rubber |
| Car Model: | NKR | Engine Model: | 100P |
| 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 | Cooling Type: | Engine coolant circulation |
| Installation: | Direct OEM replacement | Quality Standard: | OEM equivalent / ISO quality control |
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | ELF 100P | NKR | 4JB1 / 4JA1 | 1990s–2000s |
| ISUZU | NKR 100P | NKR | 4JB1 / 4JA1 | 1990s–2000s |
| ISUZU | NPR | NPR | 4JB1 / 4HF1 | 1990s–2000s |
⚠️ Important Fitment Notes:
- This rubber cup is designed for the rear wheel cylinder application with a 1-inch bore. Confirm the bore diameter of your wheel cylinder before ordering.
- The SC-80423 is the primary reference number for this rubber cup. Verify your exact OEM number against your original component.
- Both cup seals and dust boots must be replaced as a complete set per wheel when rebuilding a wheel cylinder.
- Inspect the cylinder bore for scoring or pitting before installation — if damaged, replace the entire wheel cylinder assembly.
- For right-hand drive (RHD) vehicles, verify clearance and orientation. Refer to the ISUZU workshop manual for the correct procedure.
📌 Fitment Verification: To ensure 100% accurate matching, please provide the VIN or chassis number before ordering. We will verify it through the ISUZU global EPC system.
| Feature | Benefit + Verification Signal |
|---|---|
| NBR Rubber Compound | Excellent resistance to DOT 3 / DOT 4 brake fluid, heat, and compression set — verified by material specification. |
| Cup-Shaped Sealing Lip | Expands under hydraulic pressure for a tighter seal as braking force increases — verified by product specification. |
| ISO/TS 16949:2009 Certified | Manufactured by Jingzhong under a certified quality management system — verified by product image (package label). |
| 1-Inch Bore Compatibility | Precision-matched to the ISUZU NKR 100P rear wheel cylinder — direct drop-in fit without modification. |
| Large Package Quantity (200 PCS) | Cost-effective for fleet maintenance and repair shops — verified by product image (package label). |
| 12-Month Warranty | Manufacturer-backed quality assurance — verified by product listing. |
| QC Item | Verification Method / Standard |
|---|---|
| Cup OD / ID Dimensions | CMM, 100% inspection |
| Lip Geometry Angle | Optical comparator, 100% inspection |
| Material Hardness (Shore A) | Durometer, batch sampling |
| Fluid Immersion Resistance | ASTM D471 — 70h @ 100°C in DOT 3 fluid |
| Compression Set | ASTM D395 — 70h @ 100°C |
| Tensile Strength | ASTM D412, batch sampling |
| Elongation at Break | ASTM D412, batch sampling |
| Surface Finish | Visual inspection — no flash, no contamination |
| Batch Traceability | Material lot number + production date |
| Packaging Protection | Sealed bag + moisture barrier + carton |
⚠️ IMPORTANT: Brake system service must be performed by a qualified technician. Always use clean brake fluid and work in a dust-free environment. Never reuse old cup seals.
- Disassembly: Remove the wheel, brake drum, and wheel cylinder. Remove the boot and piston assembly. Remove the piston cup from the piston. Remove the return spring and bleeder from the wheel cylinder.
- Inspection: Inspect the cylinder bore for scoring, pitting, or corrosion. If the bore is damaged, replace the entire wheel cylinder assembly. Do not attempt to rebuild a damaged cylinder.
- Cleaning: Clean all components with clean brake fluid or approved brake cleaner. Do not use petroleum-based solvents.
- Lubrication: Coat the new cups and cylinder bore with clean brake fluid before assembly.
- Assembly: Install the new cup with the sealing lip facing the hydraulic pressure source. Install the piston, boot, and return spring.
- Bleeding: Bleed the brake system completely to remove air. Check for leaks at the bleeder screw and line connections.
- Pedal Test: Pump the brake pedal several times to seat the cups. Verify a firm pedal before road testing.
| Fastener | Torque |
|---|---|
| Wheel Cylinder Mounting Bolts | Per ISUZU workshop manual specification |
| Brake Line Fittings | Per ISUZU workshop manual specification |
- Every 10,000 km: Inspect brake fluid level and condition. Check for visible fluid seepage at wheel cylinders.
- Every 40,000–50,000 km: Inspect brake drum and shoe wear. Check wheel cylinder operation.
- Every 2 years: Replace brake fluid regardless of mileage.
- Whenever the drum is removed: Inspect the cylinder bore and cup seals. Replace cups if any hardening, cracking, or swelling is found.
- Standard Packaging: Sealed bag (200 PCS/bag) + neutral carton.
- Custom Packaging: Neutral box, color box, or customer-branded packaging.
- Suitable For: Brake system repair shops, ISUZU parts distributors, fleet maintenance centers.
- Supply Capacity: Stable batch supply with batch-level quality reports available.
- MOQ: No minimum quantity requirement.
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