my Toyota Corolla E170 (2013-2019) is leaking brake fluid, what could be the problem

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.
• Wear safety gloves and goggles for protection.

2. Locate the Leak

• Tools Required: Flashlight
• Visually inspect the brake fluid reservoir, master cylinder, brake lines, calipers, and hoses.
• Identify the exact location of the leak by cleaning the area and observing for fresh fluid.

3. Replace Damaged Components

• If the leak is found in brake lines:
  • Use a socket set to disconnect the affected brake line.
  • Replace with a new brake line, ensuring it is correctly bent and secured.
• If the master cylinder is leaking:
  • Remove the brake fluid reservoir cap.
  • Disconnect the brake lines from the master cylinder.
  • Unbolt the master cylinder from the brake booster.
  • Install a new master cylinder and reconnect the brake lines, ensuring they are torqued to manufacturer specifications (usually around 12-15 ft-lbs).
• If calipers are leaking:
  • Remove the wheel to access the brake caliper.
  • Unbolt the caliper, remove it, and replace it with a new one.
  • Ensure to replace or rebuild the caliper if necessary.

4. Refill and Bleed Brake System

• Tools Required: Brake fluid, brake bleeder kit
• Refill the brake fluid reservoir with the recommended brake fluid (DOT 3 or DOT 4).
• Bleed the brake system starting from the wheel farthest from the master cylinder (usually the right rear wheel) to remove any air.
• Ensure all brakes are firm after bleeding.

5. Final Inspection

• Inspect all connections for leaks after replacing parts.
• Check brake pedal feel and ensure it is firm.
• Clean up any spilled brake fluid to prevent damage to paint and components.