why does my Toyota Corolla E140 (2006-2013) brake pedal feel soft?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is off.
• Set the parking brake and wear safety glasses and gloves.

2. Inspect and Replace Brake Fluid

• Tools Required: Brake fluid, funnel, clean rags.
• Check the brake fluid level. If low, top off with the manufacturer-recommended brake fluid (DOT 3 or DOT 4).
• If the fluid appears contaminated, proceed to replace it:
  1. Remove the master cylinder cap.
  2. Using a clean funnel, drain old brake fluid and replace it with new fluid.
  3. Reinstall the master cylinder cap securely.

3. Check and Repair Brake Lines

• Tools Required: Wrench set, brake line repair kit (if leaks found).
• Inspect brake lines for damage or leaks. If any are found:
  1. Mark the damaged section.
  2. Use a wrench to disconnect the affected section.
  3. Replace with a new brake line or repair using a brake line repair kit.
  4. Reconnect and ensure all fittings are tight.

4. Bleed the Brakes

• Tools Required: Brake bleeder kit, clean rags, helper (optional).
• To remove air from the brake lines:
  1. Start at the brake furthest from the master cylinder (usually the rear passenger side).
  2. Attach the brake bleeder kit to the bleeder valve on the caliper.
  3. Open the valve and have an assistant press the brake pedal slowly until fluid flows without air bubbles, then close the valve before they release the pedal.
  4. Repeat for all brakes in the order: rear passenger, rear driver, front passenger, front driver.
  5. Recheck brake fluid level in the master cylinder and top off as necessary.