Corrosion-Resistant Rear Brake Wheel Cylinder with EPDM Rubber Seals for Direct OEM Replacement in Isuzu NKR55 4JB1

The Rear Brake Wheel Cylinder (OEM Numbers: 8-97139840-0 / 8971398400 and 8-94128141-3 / 8941281413) is a premium-quality, direct replacement hydraulic component designed for the rear drum brake system of Isuzu NKR55 light-duty trucks equipped with the 4JB1 diesel engine.

• OE Quality: Manufactured to Isuzu dimensional and material specifications for perfect fit and reliable braking
• Precision-Machined Bore: Smooth honed cylinder bore ensures consistent piston movement and long seal life
• Corrosion-Resistant: Body with anti-corrosion treatment for durability
• High-Quality Rubber Seals: EPDM cups and seals resist DOT 3/DOT 4 brake fluid, heat, and aging
• Dust Boot Included: Protects the bore from dirt and moisture
• Leak-Tested: Each cylinder is hydraulically tested for leakage before packaging
• Restores Braking Performance: Eliminates spongy pedal, fluid leaks, and uneven braking
• Direct Replacement: Matches OE mounting bolt pattern, inlet port location, and bleeder screw position
• Cost-Effective: Affordable alternative to genuine OEM without compromising safety

This rear brake wheel cylinder is specifically designed for Isuzu NKR55 trucks with 4JB1 engine.

Installation steps (typical for rear wheel cylinder):

1. Safely lift and support the vehicle - remove the rear wheel and brake drum
2. Clean the brake assembly - use brake cleaner to remove dust and debris
3. Disconnect the brake line - from the back of the old wheel cylinder using a flare nut wrench. Cap the line
4. Remove the old wheel cylinder - unbolt the two mounting bolts from the backing plate
5. Clean the backing plate mounting surface - remove old gasket/sealant
6. Compare new cylinder with old - verify bore size, bolt spacing, and port orientation
7. Install new wheel cylinder - apply a thin film of brake grease to the mounting flange. Bolt to backing plate. Torque bolts to specification (typically 10-15 Nm)
8. Reconnect the brake line - hand-start, then tighten with flare nut wrench. Do not cross-thread
9. Reinstall brake shoes and hardware - ensure pushrods engage properly
10. Reinstall brake drum and wheel - adjust shoes if needed
11. Bleed the brake system - start from the wheel farthest from the master cylinder
12. Check for leaks - inspect the new cylinder and line fitting
13. Test drive - ensure proper braking and no pulling

• Material Verification: Body alloy and seal compound tested
• Dimensional Inspection: Bore diameter, bolt hole spacing, and thread pitch verified against OE samples
• Leak Test (Hydraulic): Each cylinder pressurized to ensure no internal or external leakage
• Piston Movement Test: Smooth operation confirmed over full stroke
• Thread Inspection: Inlet and bleeder threads checked with GO/NO-GO gauges
• Visual Inspection: 100% checked for casting defects, scratches, or damaged ports
• Packaged Safely: Cylinder sealed in plastic bag, boxed with foam protection

• 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