why does my Honda Civic 9th Generation (2012-2015) brake pedal feel spongy and goes to the floor

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and securely raise it using jack stands.
• Disconnect the negative battery terminal to prevent electrical shorts during repair.

2. Brake Fluid Inspection and Replacement

• Sub-steps:
  1. Remove the brake fluid reservoir cap.
  2. Check the fluid level and condition; if it's low or contaminated, proceed to replace it.
  3. Use a turkey baster to remove old brake fluid from the reservoir.
  4. Refill the reservoir with new brake fluid (DOT 3 or DOT 4 as specified by the manufacturer).

3. Brake Line Inspection and Repair

• Sub-steps:
  1. Visually inspect all brake lines for signs of corrosion, cracks, or leaks.
  2. If leaks are found, replace the damaged section of the brake line with new line and appropriate fittings.
  3. Use a flare tool to ensure proper connections are made.

4. Brake Master Cylinder Replacement (if necessary)

• Sub-steps:
  1. Locate the brake master cylinder; disconnect the brake lines and electrical connectors.
  2. Unbolt the master cylinder from the brake booster using a socket set.
  3. Install the new master cylinder by reversing the removal process and ensuring all connections are secure.
  4. Bleed the brake system to remove any air trapped in the lines (see bleeding instructions below).

5. Brake System Bleeding

• Sub-steps:
  1. Begin at the wheel farthest from the master cylinder (usually the right rear).
  2. Attach a clear tube to the bleeder valve and place the other end in a container.
  3. Have an assistant press the brake pedal while you open the bleeder valve to allow air and fluid to escape; close the valve before the pedal is released.
  4. Repeat until no air bubbles appear in the fluid.
  5. Move to the next wheel and repeat the process in the following order: right rear, left rear, right front, left front.