my Toyota RAV4 brakes feel soft how to fix this issue

Solution

1. Preparation

• Tools Required: Socket set, brake fluid, brake cleaner, OBD-II scanner, multimeter, torque wrench.
• Ensure the vehicle is parked on a level surface and the ignition is off.
• Disconnect the negative battery terminal to prevent electrical issues.

2. Check and Refill Brake Fluid

• Sub-steps:
  1. Open the master cylinder reservoir cap.
  2. Inspect the fluid level; if low, top it up with the manufacturer-recommended brake fluid (DOT 3 or DOT 4).
  3. Reinstall the cap securely.

3. Bleed the Brake System

• Sub-steps:
  1. Start at the wheel farthest from the master cylinder (typically the right rear).
  2. Attach a clear tube to the bleeder screw on the brake caliper.
  3. Have an assistant press the brake pedal several times and hold it down.
  4. Open the bleeder screw to release air and old fluid, then close it before your assistant releases the pedal.
  5. Repeat until no air bubbles are visible in the tube, then move to the next wheel (left rear, right front, left front).
• Safety Warning: Use caution with brake fluid as it can damage paint. Clean any spills immediately.

4. Inspect and Replace Brake Components

• Sub-steps:
  1. Inspect brake pads and rotors for wear; replace if they are worn below specification.
  2. Inspect calipers for proper movement; replace if seized.
  3. Check brake lines for any signs of corrosion or damage; replace if necessary.
• Torque Values: Refer to the vehicle's service manual for specific torque specifications for caliper bolts.

5. Test Brake Booster (if applicable)

• Sub-steps:
  1. With the engine off, pump the brake pedal until it becomes firm.
  2. Start the engine; the brake pedal should drop slightly. If not, the brake booster may be faulty and requires replacement.