why does my Toyota Highlander Fourth Generation (2020-present) brake fluid keep leaking

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a flat surface.
• Disconnect the negative battery terminal for safety.

2. Identify Leak Source

• Inspect Brake Lines:
  • Use a flashlight to examine all brake lines.
  • Look for cracks, rust, or fluid buildup.
• Check Calipers & Wheel Cylinders:
  • Remove the wheel to access brake components.
  • Inspect calipers for wetness around seals.
• Examine Master Cylinder:
  • Remove any covers and inspect for leaks around seals.

3. Replace Damaged Components

• If Brake Lines are Leaking:
  • Use a line cutter to remove the damaged section.
  • Replace with new brake line, flaring the ends as necessary.
• If Calipers are Leaking:
  • Remove the caliper from the mounting bracket.
  • Replace the caliper with a new one or rebuild with new seals.
• If Master Cylinder is Leaking:
  • Unbolt the master cylinder from the brake booster.
  • Replace with a new master cylinder, ensuring proper alignment.

4. Refill and Bleed Brake System

• Refill the brake fluid reservoir with the recommended brake fluid (DOT 3 or DOT 4).
• Bleed the brake lines using a brake bleeder or helper to ensure air is removed from the system.

5. Reassemble and Test

• Reinstall any removed components (wheels, covers).
• Reconnect the battery terminal.
• Test the brake pedal feel and ensure the brake warning light is off.