Rear Brake Wheel Cylinder 8-94131652-0 8941316520 8-97078609-0 For ISUZU NPR59 N-Series 4BD1 4HF1 — OEM Rear Drum Brake Cylinder 1-1/16" Bore
| OEM Part Number: | 8-94131652-0 / 8941316520 / 94131652 / 8-97078609-0 / 8970786090 | Part Name: | Rear Brake Wheel Cylinder / Drum Brake Wheel Cylinder |
| Fitting Position: | Rear, Both Left And Right (LH/RH) | Bore Diameter: | 1-1/16" (27mm / 1.063 In) |
| 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 (1987-1993), Chevrolet W-Series (1987-1993), GMC W-Series (1987-1993) |
| Condition: | Brand New — 100% Quality Inspected | Warranty: | 12 Months |
| High Light: | ISUZU NPR59 rear brake cylinder,OEM drum brake wheel cylinder,1-1/16 bore brake cylinder |
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The Rear Brake Wheel Cylinder with OEM numbers 8-94131652-0 (also listed as 8941316520, 94131652) and 8-97078609-0 (also listed as 8970786090) is a verified OEM-grade direct replacement for ISUZU NPR59, KS, and N-Series trucks. 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 8-94131652-0, 8941316520, 8-97078609-0, and 8970786090
- Precision 1-1/16" (27mm) 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 NPR59, KS, and N-Series (1987-1993) with 4BD1, 4BD2, 4HF1 engines
| Part Number | 8-94131652-0 8941316520 8-97078609-0 |
|---|---|
| Product Name | Rear Brake Wheel Cylinder |
| Car Model | ISUZU NPR59 N-Series |
| Engine Model | ISUZU 4BD1 4HF1 |
| Condition | 100% Brand New |
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 — indicates worn seals
- Soft or Spongy Brake Pedal: Pedal feels unusually soft or goes to the floor — indicates internal seal failure or fluid bypass
- Reduced Braking Performance: Vehicle takes longer to stop or requires increased pedal pressure
- Uneven Braking: Vehicle pulls to one side during braking — indicates a seized or leaking cylinder on one side
- Contaminated Brake Shoes: Brake fluid soaking into the brake shoes, causing reduced friction and brake fade
Primary Applications:
| Brand | Model / Chassis | Engine | Years |
|---|---|---|---|
| ISUZU | NPR59 | 4BD1, 4BD2, 4HF1 | 1987-1993 |
| ISUZU | KS | 4BD1, 4BD2, 4HF1 | 1987-1993 |
| ISUZU | N-Series (NPR, NQR) | 4BD1, 4BD2, 4HF1 | 1987-1993 |
| Chevrolet | W4, W4500 Tiltmaster | — | 1987-1993 |
| GMC | W4, W4500 Forward | — | 1987-1993 |
Important:
- This brake wheel cylinder is designed for ISUZU N-Series trucks (NPR59, KS, NPR, NQR) with drum brake systems
- Fits rear, both left and right (LH/RH) positions
- Compatible with 1987-1993 model years
- Also fits Chevrolet and GMC W-Series commercial trucks from 1987-1993
- Bleeder screw not included — must be transferred from the old cylinder or purchased separately
- It is 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
Guarantees factory-fit quality and performance — verified by OEM part numbers
Delivers consistent hydraulic pressure for reliable braking performance
Provides exceptional durability and heat dissipation under demanding conditions
Delivers superior resistance to heat, corrosion, and brake fluid
Ensures optimum sealing surface for pressure cups, extending component life
No modifications required — engineered as a direct match for the original cylinder
Guarantees dependable operation and leak-free performance
Guarantees zero wear, immediate braking performance, and full service life
Our manufacturing and inspection processes ensure every brake wheel cylinder meets or exceeds ISUZU OEM standards.
| QC Item | Verification Method |
|---|---|
| Dimensional Accuracy | Precision inspection to verify 1-1/16" (27mm) bore diameter, M10 x 1.0 inlet threads, and mounting hole spacing match OE blueprint specifications |
| 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 |
IMPORTANT: Professional Installation Recommended
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 (refer to ISUZU workshop manual)
- Reconnect the brake line and torque to specification
- CRITICAL: Bleed the brake system thoroughly to remove all air (start with the wheel furthest from the master cylinder)
- 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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