Rear Brake Wheel Cylinder 8-94131651-0 8941316510 8-97078610-0 For ISUZU NPR N-Series 4BD1 4HF1 — OEM Rear Passenger Side Rearward Drum Brake Cylinder 1-1/16" Bore
| OEM Part Number: | 8-94131651-0 / 8941316510 / 94131651 / 8-97078610-0 / 8970786100 | Part Name: | Rear Brake Wheel Cylinder / Drum Brake Wheel Cylinder |
| Fitting Position: | Rear Passenger Side, Rearward | Bore Diameter: | 1-1/16" (26.99mm / 27mm) |
| Inlet Thread Size: | (2) M10 X 1.0 | Material: | High-Grade Cast Iron |
| Rubber Components: | High-Quality EPDM Rubber Cups And Boots | Bleeder Screw: | Not Included |
| Package Contents: | 1 Brake Wheel Cylinder (Bleeder Screw Sold Separately) | Vehicle Compatibility: | ISUZU N-Series (1986-1993), Chevrolet W-Series (1987-1993), GMC W-Series (1987-1993) |
| Condition: | Brand New — 100% Quality Inspected | Warranty: | 12 Months |
| High Light: | ISUZU NPR brake wheel cylinder,Rear drum brake cylinder 1-1/16 bore,OEM ISUZU N-Series brake cylinder |
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The Rear Brake Wheel Cylinder with OEM numbers 8-94131651-0 (also listed as 8941316510, 94131651) and 8-97078610-0 (also listed as 8970786100) is a verified OEM-grade direct replacement for ISUZU NPR and N-Series trucks equipped with 4BD1 and 4HF1 engines. Manufactured to ISUZU's stringent OEM specifications, this rear brake wheel cylinder is a critical component of the drum brake system that converts hydraulic pressure from the brake master cylinder into mechanical force, pushing the brake shoes against the drum to provide safe and reliable stopping power.
- OEM Specification — Verified by ISUZU OEM part numbers 8-94131651-0, 8941316510, 8-97078610-0, and 8970786100
- Precision 1-1/16" (26.99mm) Bore — Delivers consistent hydraulic pressure for reliable braking performance
- Proven Durability — Constructed from high-grade cast iron with EPDM rubber components for superior heat and corrosion resistance
- Broad Compatibility — Fits ISUZU NPR, N-Series (1986-1993) with 4BD1, 4BD2, 4HF1 engines
- Cross-Brand Compatibility — Also fits Chevrolet and GMC W-Series (1987-1993)
If your rear brake wheel cylinder is failing, you may experience one or more of the following symptoms:
- Brake Fluid Leakage: Visible fluid seeping from the rear wheels or inside the brake drum
- Soft or Spongy Brake Pedal: Pedal feels unusually soft or goes to the floor
- Reduced Braking Performance: Vehicle takes longer to stop or requires increased pedal pressure
- Uneven Braking: Vehicle pulls to one side during braking
- Contaminated Brake Shoes: Brake fluid soaking into the brake shoes, causing reduced friction
Primary Applications:
| Brand | Model / Chassis | Engine | Years |
|---|---|---|---|
| ISUZU | N-Series (NPR, NQR, NPR-HD) | 4BD1, 4BD2, 4BE1, 4HF1 | 1986-1993 |
| ISUZU | NPR59 | 4BD1, 4HF1 | — |
| Chevrolet | W-Series (W3500, W4, W5500 Tiltmaster) | — | 1987-1993 |
| GMC | W-Series (W3500, W4, W5500 Forward) | — | 1987-1993 |
Additional Compatibility:
| Brand | Model | Engine |
|---|---|---|
| ISUZU | NKR | 4BD1, 4HF1 |
| ISUZU | NPR | 4BD2 3.9L, 4HE1 4.8L, 4HK1 5.2L |
- Designed for ISUZU N-Series trucks (NPR, NQR, NPR-HD) with drum brake systems
- Fits rear passenger side, rearward position — verify your vehicle's configuration before ordering
- Bleeder screw not included — must be transferred from the old cylinder or purchased separately
- Strongly recommended to replace brake wheel cylinders in pairs (both rear wheels)
- Please verify your vehicle's chassis code, production year, and VIN before ordering
| QC Item | Verification Method |
|---|---|
| Dimensional Accuracy | Precision inspection to verify 1-1/16" bore diameter, M10 x 1.0 inlet threads, and mounting hole spacing |
| Material Composition | Cast iron analysis to verify structural integrity and heat dissipation characteristics |
| Bore Surface Test | 100% surface testing to ensure optimum sealing surface for pressure cups |
| Leakage Test | 100% hydraulic pressure test to guarantee zero fluid leakage under operating conditions |
| Rubber Component Test | EPDM material verification for heat and corrosion resistance |
| Durability Cycle Test | 500+ hour fatigue testing to verify long-term reliability |
| Final Assembly Inspection | 100% visual and functional inspection before packaging |
Replacing brake wheel cylinders is a critical safety procedure. It is strongly recommended to replace them in pairs.
Pre-Installation Checklist:
- Safely raise the vehicle and support it on jack stands
- Remove the rear wheels and brake drums to access the wheel cylinders
- Bleeder screw not included — transfer the old bleeder screw or purchase a new one
- Inspect brake shoes, drums, and hardware for wear — replace as necessary
- Use new brake fluid (DOT 3 or DOT 4) from a sealed container
- Critical: Replace wheel cylinders in pairs (both rear wheels) for balanced braking performance
Installation Guidelines (Reference ISUZU workshop manual):
- Safely raise the vehicle and support it on jack stands
- Remove the rear wheels and brake drums
- Disconnect the brake line from the old wheel cylinder
- Remove the mounting bolts securing the cylinder to the backing plate
- Remove the old cylinder and clean the backing plate thoroughly
- CRITICAL: Install the new cylinder with NEW mounting bolts
- Torque the mounting bolts to manufacturer's specified torque settings
- Reconnect the brake line and torque to specification
- CRITICAL: Bleed the brake system thoroughly to remove all air
- Refill with fresh DOT 3 or DOT 4 brake fluid
- Reinstall the brake drums and wheels
- Test brake pedal feel and braking performance before road test
Maintenance Schedule:
- Inspection: Every 50,000 km / 12 months. Check for fluid leaks, brake pedal feel, and braking performance
- Fluid Replacement: Every 2 years or 40,000 km — replace brake fluid to prevent internal corrosion
- Replacement: Immediately if failure symptoms appear. Replace in pairs for balanced braking
- Packaging: Each brake wheel cylinder is securely packed in protective packaging
- Package Contents: 1 Drum Brake Wheel Cylinder (Bleeder screw sold separately)
- Suitable for: Wholesale distributors, truck parts retailers, commercial vehicle repair shops, and fleet owners
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