ISUZU FSR113 6BD1 Front Wheel Cylinder Cup Set OEM Fit 1-87830398-0 with NBR/EPDM Rubber Material for 1-7/16 inch Bore
| Fluid Compatibility: | DOT 3 / DOT 4 Brake Fluid | Kit Contents: | Cup Seals + Dust Boots (per Wheel) |
| Cylinder Bore Size: | 1-7/16 Inch (36.5 Mm) | Material: | NBR (Nitrile) / EPDM Rubber |
| Temperature Range: | −40°C To +120°C | Compression Set Resistance: | ≤ 25% After 70h @ 100°C |
| Installation Success Rate: | ≥ 99% | Tensile Strength: | ASTM D412, Batch Sampling |
| High Light: | OEM Fit 1-87830398-0 Front Wheel Cylinder Cup Set,NBR/EPDM Rubber Material Wheel Cylinder Cup Seal,1-7/16 inch Bore Size Brake Cylinder Cup Kit |
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Front Wheel Cylinder Cup Set 1-87830398-0 1878303980 for ISUZU FSR113 6BD1 — Verified OEM Fit for Front Drum Brake Hydraulic Sealing System
This cup set is a critical sealing component of the front drum brake hydraulic system, responsible for maintaining hydraulic pressure inside the wheel cylinder and ensuring even braking force transfer to the brake shoes.
The front wheel cylinder cup set functions as the primary hydraulic seal within the wheel cylinder. It converts hydraulic brake fluid pressure into mechanical force that pushes the brake shoes against the 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.
Replace the cup set 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 — vehicle pulls to one side during braking, or stopping distance increases
- Brake fluid contamination — degraded rubber particles from worn cups contaminate the brake fluid
| Verification Item | Data / Standard | Source / Method |
|---|---|---|
| Part Number (Short) | 1-87830398-0 | ISUZU OEM Parts Database |
| Part Number (Long) | 1878303980 | ISUZU OEM Parts Database |
| Part Name | CUP SET; FRT WHEEL CYL | ISUZU EPC |
| Vehicle Model | ISUZU FSR113 | ISUZU application catalog |
| Engine Compatibility | 6BD1 | ISUZU application catalog |
| Cylinder Bore Size | 1-7/16 inch (36.5 mm) | ISUZU workshop specification |
| Material | NBR (Nitrile) / EPDM Rubber | Material certificate |
| Fluid Resistance | DOT 3 / DOT 4 brake fluid compatible | ASTM D471 immersion test |
| Temperature Range | −40°C to +120°C | Material datasheet |
| Compression Set Resistance | ≤ 25% after 70h @ 100°C | ASTM D395 |
| Installation Success Rate | ≥ 99% | Based on repair order tracking |
| Certification | ISO/TS 16949 | Third-party system audit |
| Part Number: | 1-87830398-0 | Product Name: | Wheel Cylinder Cup Set |
| Car Model: | FSR113 | Engine Model: | 6BD1 |
| Condition: | 100% Brand New | Size: | Standard |
| Origin: | China Mainland | Main Market: | Middle East, Asia, Africa, South America, North America & Europe |
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | FSR | FSR113 | 6BD1 | 1980–1994 |
| ISUZU | FSR | FSR11 / FSR12 | 6BD1 | 1980–1986 |
- The FSR113 front drum brake uses two wheel cylinders per wheel (one front-facing, one rear-facing). Verify which cylinder requires the cup set before ordering
- The cylinder bore size is 1-7/16 inch (36.5 mm). Confirm this matches your wheel cylinder before installation
- For right-hand drive (RHD) vehicles, the wheel cylinder orientation may differ. Refer to the ISUZU workshop manual for the correct procedure
Exceptional resistance to DOT 3 and DOT 4 brake fluid swelling, heat degradation, and compression set — verified by ASTM D471 and ASTM D395 testing.
Cup-shaped sealing lip expands under hydraulic pressure for a tighter seal as braking force increases — verified against OEM bore diameter specifications.
Precision-matched to the ISUZU FSR113 front wheel cylinder bore — direct drop-in fit without modification.
Cup seals and dust boots supplied together to meet ISUZU service manual requirements — reduces the risk of partial repair and premature failure.
Full traceability with material certificates and batch inspection reports — third-party certified.
Based on repair order tracking — confirms reliable fitment across the FSR113 platform.
| 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 |
Reference ISUZU Workshop Manual:
- 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.
- 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 + moisture barrier + carton
- Custom Packaging: Neutral packaging, 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
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