04478-OK130 Cylinder kit, disc brake For 04478OK130 Toyota FORTUNER HILUX KUN51

Product Specification

Product Function Description

The disc brake cylinder repair kit is a critical component for restoring your Toyota Fortuner or Hilux front brake caliper. This kit contains the internal seals, pistons, and dust boots needed to rebuild the brake caliper, restoring proper hydraulic sealing and piston movement. For Toyota Fortuner and Hilux KUN51 models equipped with front disc brakes, a properly functioning caliper rebuild kit ensures consistent braking pressure, even pad wear, and reliable stopping performance. This component is designed to factory specifications, ensuring proper fit and reliable brake system operation.

Common Symptoms of a Failing Brake Caliper

If you are experiencing any of the following symptoms, your brake caliper may need rebuilding using this repair kit:

• Brake fluid leaks: Visible fluid leaks around the caliper or inside the wheel area – this indicates the piston seals have failed

• Spongy or soft brake pedal: The pedal feels mushy or requires more pressure – this suggests hydraulic pressure loss from internal leakage

• Uneven brake pad wear: One pad worn more than the other on the same caliper – this indicates a sticking piston

• Vehicle pulls to one side: The vehicle drifts during braking – this suggests a seized or sticking caliper piston

• Reduced braking performance: The vehicle takes longer to stop – this may be caused by caliper seal degradation

• Excessive brake dust: One wheel has significantly more brake dust than the others – this indicates the caliper is not releasing properly

If you have confirmed these symptoms through inspection, rebuilding the caliper with this kit is the recommended solution.

How to Diagnose a Faulty Brake Caliper

Before purchasing a repair kit, perform these simple checks to confirm the caliper needs rebuilding:

• Visual Inspection: Look for brake fluid leaks around the caliper, especially near the piston boot area. Check for torn or deteriorated dust boots.

• Physical Test: With the wheel removed and the caliper still installed, have an assistant press the brake pedal while you observe the caliper piston movement (where visible). Uneven or no movement indicates a seized piston.

• Pad Wear Check: Remove the brake pads and compare inner and outer pad thickness. Significant difference indicates piston sticking.

• Brake Drag Test: After driving, check if one wheel is significantly hotter than the others – this indicates the caliper is sticking and not releasing fully.

Product Specifications

Why Choose This Brake Caliper Repair Kit?

Restores Braking Performance – A failing caliper seal allows fluid bypass and reduces braking effectiveness. This kit restores proper hydraulic sealing for consistent, reliable stopping power.

Prevents Uneven Pad Wear – Sticking pistons cause uneven pad wear and reduced pad life. New seals and components restore smooth piston movement for even pad pressure.

Cost-Effective Repair – Rebuilding the existing caliper with this kit is significantly more economical than replacing the entire caliper assembly while delivering the same functional result.

Direct Replacement – Precision-engineered to match the original caliper seal specifications. Direct internal replacement – no modifications required.

Proven Compatibility – This kit is confirmed compatible with Toyota Fortuner KUN51 and Hilux KUN51 front brakes. 

Essential for Brake Service – When replacing brake pads or servicing calipers, rebuilding with new seals and boots ensures the caliper operates like new.

Package Contents

1 x Disc Brake Caliper Repair Kit – Includes pistons, seals, dust boots, and internal components (confirm exact contents before purchase). Note: This is a rebuild kit only – the caliper housing is NOT included. Brake pads, brake fluid, and mounting hardware are NOT included. Please confirm compatibility with your Toyota model and year before purchasing. This kit fits the front axle position.

DIY or Professional Installation?

This replacement is suitable for DIY if:

• You have intermediate mechanical skills and the required tools (socket set, brake bleeder kit, caliper piston press, brake fluid).

• You are comfortable working with brake systems and hydraulic components.

• The job takes approximately 1-2 hours per caliper.

We recommend professional installation if:

• You are not comfortable with brake system repairs.

• You do not have the proper tools for brake bleeding and piston compression.

• You are not confident in your mechanical skills.

Note: Improper installation can lead to brake failure, safety issues, and warranty concerns. Brake fluid is highly corrosive – protect painted surfaces. Always bleed the brake system after caliper rebuild.

Step-by-Step Installation Guide

This installation guide is designed to help you rebuild your brake caliper with confidence. Before starting, ensure the vehicle is parked on level ground with the engine off and the brake system depressurized. You will need the following tools: socket set, brake bleeder kit, caliper piston press tool, brake fluid, and a clean work area.

Step 1: Safely raise the vehicle and support it with jack stands. Remove the front wheel on the side you are working on.

Step 2: Remove the brake caliper from the vehicle. Do not disconnect the brake hose unless replacing it – suspend the caliper with a wire to avoid stressing the hose.

Step 3: Remove the brake pads and note their position for reassembly. Clean the caliper exterior thoroughly.

Step 4: Carefully remove the old pistons, seals, and dust boots from the caliper. Clean the caliper bore thoroughly – remove all old seal residue and debris.

Step 5: Install the new seals, pistons, and dust boots from the kit in the correct order. Lubricate new seals with clean brake fluid before installation.

Step 6: Reinstall the caliper onto the vehicle with the brake pads. Bleed the brake system to remove air. Test brake pedal feel – it should be firm and consistent.

Pro Tip: Always replace brake pads and hardware when rebuilding calipers for best results. Use the correct DOT brake fluid as specified for your vehicle. Clean the caliper bore with brake cleaner and inspect for scoring before installation.

After-Sales Service & Warranty

This product is covered by our quality assurance. If you have any questions or issues regarding fitment or quality, please contact us and we will respond within 24 hours.

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