Rear Brake Wheel Cylinder 8-97349708-0 8973497080 For ISUZU ELF NPR NQR NLR85 NMR85 4HK1-T

The Rear Brake Wheel Cylinder (OEM Numbers: 8-97349708-0 / 8973497080 / 8-97349-708-0 / 97349708) is a premium-quality, direct replacement hydraulic brake component designed specifically for ISUZU ELF, NPR, NQR, NLR85, and NMR85 series trucks equipped with 4HK1-T diesel engines and other compatible powertrains. This precision-engineered wheel cylinder is a critical component of the rear drum brake system — it receives pressurized brake fluid from the master cylinder via the brake lines and converts it into mechanical force, pushing the brake shoes outward against the brake drum to slow or stop the vehicle safely and effectively.

Function: The rear brake wheel cylinder converts hydraulic pressure from the master cylinder into mechanical force to push brake shoes against the drum, ensuring safe and reliable rear braking in ISUZU trucks.

• OE Quality: Manufactured to strict ISUZU dimensional and material specifications for perfect fit and function.
• Precision-Honed Bore: Smooth, accurate 30.16mm bore ensures consistent piston movement and reliable brake actuation.
• Cast Iron Construction: High-strength cast iron housing withstands high hydraulic pressures and continuous operation.
• High-Quality EPDM Rubber Cups: Durable rubber cups and boots provide long-lasting performance and leak prevention.
• Corrosion-Resistant Housing: Treated cast iron housing resists corrosion from moisture and road salt.
• Restores Braking Performance: Eliminates spongy pedal feel, pulling, and reduced stopping power caused by faulty cylinders.
• Prevents Brake Fluid Leaks: Precision seals and machining prevent fluid loss that compromises braking safety.
• Direct Replacement: Matches OE cylinder dimensions, mounting points, and brake line connections.
• Even Brake Application: Replacing in pairs ensures balanced, pull-free braking.
• Essential for Brake Safety: Critical component that directly affects vehicle stopping distance and safety.

This rear brake wheel cylinder is specifically designed for ISUZU light-duty trucks and commercial vehicles. Common applications include:

• ISUZU ELF (Light-Duty Trucks)
• ISUZU NPR (Medium-Duty Trucks)
• ISUZU NQR (Medium-Duty Trucks)
• ISUZU NLR85 (Light-Duty Trucks)
• ISUZU NMR85 (Light-Duty Trucks)
• ISUZU NNR (Light-Duty Trucks)
• ISUZU NMS85 E-5 (Light-Duty Trucks)
• Chevrolet W3500 / W4500 (Low Cab Forward)
• GMC W3500 / W4500 (Low Cab Forward)

• ISUZU 4HK1-T — 5.2L Inline-4 Turbo Diesel
• ISUZU 4JJ1 — 3.0L Inline-4 Turbo Diesel
• ISUZU 4JH1 — 3.0L Inline-4 Diesel
• ISUZU 4KH1 — 3.0L Inline-4 Turbo Diesel
• Application: Light- and medium-duty trucks and commercial vehicles

Professional mechanic installation is essential for safety:

1. Ensure vehicle is safely raised — Use appropriate jack stands to support the vehicle; remove the rear wheel.
2. Remove the brake drum — Remove the brake drum to access the wheel cylinder and brake shoes.
3. Remove the brake shoes — Carefully remove the brake shoe assembly; note the spring and hardware positions.
4. Disconnect the brake line — Disconnect the brake fluid line from the wheel cylinder; cap the line to prevent fluid loss.
5. Remove the old wheel cylinder — Unbolt the wheel cylinder from the backing plate.
6. Inspect the backing plate — Check the backing plate for damage, wear, or corrosion.
7. Install the new wheel cylinder — Position the new cylinder on the backing plate; install mounting bolts.
8. Torque mounting bolts — Tighten bolts to manufacturer torque specifications.
9. Reconnect the brake line — Reconnect the brake line to the new cylinder; torque the fitting to specification (M10 x 1.0 inlet thread).
10. Reinstall brake shoes — Reinstall the brake shoe assembly with new springs and hardware.
11. Adjust brake shoes — Adjust the brake shoe-to-drum clearance to manufacturer specification.
12. Reinstall the brake drum — Install the brake drum; ensure proper fit and adjustment.
13. Bleed the brake system — Bleed the brake system to remove air; start with the wheel furthest from the master cylinder. Use DOT 3/4 brake fluid.
14. Check for leaks — Inspect all connections for fluid leaks; ensure the cylinder is not leaking.
15. Test brake pedal — Pump the brake pedal; ensure firm pedal feel and proper pedal height.
16. Road test — Test the brakes at low speed in a safe area; verify proper stopping performance.

• Material Verification: Confirms cast iron housing and EPDM rubber cup materials meet ISUZU durability and brake fluid compatibility specifications.
• Bore Dimensional Inspection: Cylinder bore diameter (30.16mm), finish, and roundness verified within OEM tolerances.
• Seal Integrity Testing: Each cylinder tested for seal performance and leak-proof operation.
• Piston Fit Verification: Piston fit and movement checked for smooth operation.
• Pressure Testing: Sample tested to ensure consistent hydraulic pressure output.
• Visual Inspection: 100% checked for casting defects, machining flaws, and seal damage.
• Packaged Safely: Protected and packaged to prevent damage during transit.

• Neutral export packing or customized packaging available
• Carton or wooden case for safe transportation
• Fast delivery for stock items
• Shipping by Express Air or Sea