ISUZU FSR113 6BD1 Front Wheel Cylinder Cup Set 1-87830398-0 OEM Fit with 1-7/16 inch Bore and NBR/EPDM Rubber
| Fluid Compatibility: | DOT 3 / DOT 4 Brake Fluid | Cylinder Bore Size: | 1-7/16 Inch (36.5 Mm) |
| Kit Contents: | Cup Seals + Dust Boots (per Wheel) | Material: | NBR (Nitrile) / EPDM Rubber |
| Temperature Range: | −40°C To +120°C | Compression Set Resistance: | ≤ 25% After 70h @ 100°C |
| Installation Success Rate: | ≥ 99% | Engine Compatibility: | 6BD1 |
| High Light: | OEM Fit Wheel Cylinder Cup Set,1-7/16 inch Bore Brake Cup Set,NBR/EPDM Rubber Front Wheel Cylinder Cup Set |
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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.
- 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 |
| 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 |
| Temperature Range | −40°C to +120°C | Material datasheet |
| Installation Success Rate | ≥ 99% | Based on repair order tracking |
| Certification | ISO/TS 16949 | Third-party system audit |
| 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)
- Cylinder bore size is 1-7/16 inch (36.5 mm) — confirm this matches your wheel cylinder
- For right-hand drive (RHD) vehicles, wheel cylinder orientation may differ
| Feature | Benefit + Verification Signal |
|---|---|
| NBR / EPDM Rubber Compound | Exceptional resistance to DOT 3 and DOT 4 brake fluid swelling, heat degradation, and compression set |
| OEM-Exact Lip Geometry | Cup-shaped sealing lip expands under hydraulic pressure for tighter seal as braking force increases |
| 1-7/16" Bore Compatibility | Precision-matched to ISUZU FSR113 front wheel cylinder bore — direct drop-in fit |
| Complete Set Per Wheel | Cup seals and dust boots supplied together to meet ISUZU service manual requirements |
| ISO/TS 16949 Quality System | Full traceability with material certificates and batch inspection reports |
- Disassembly: Remove wheel, brake drum, and wheel cylinder components
- Inspection: Inspect cylinder bore for scoring, pitting, or corrosion
- Cleaning: Clean all components with clean brake fluid or approved brake cleaner
- Lubrication: Coat new cups and cylinder bore with clean brake fluid
- Assembly: Install new cup with sealing lip facing hydraulic pressure source
- Bleeding: Bleed brake system completely to remove air
- Pedal Test: Pump brake pedal to seat cups and verify firm pedal
- Every 10,000 km: Inspect brake fluid level and condition
- Every 40,000–50,000 km: Inspect brake drum and shoe wear
- Every 2 years: Replace brake fluid regardless of mileage
- Whenever drum is removed: Inspect cylinder bore and cup seals
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