why is my BMW X3 G01 (2018-2024) brake pedal soft and goes to the floor

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Wear safety gloves and goggles for protection.

2. Inspect and Replace Brake Fluid

• Sub-steps:
  1. Open the hood and locate the brake master cylinder reservoir.
  2. Remove the cap and check the fluid level; if low, top off with the recommended brake fluid (DOT 4).
  3. If the fluid is contaminated, proceed to replace it.

3. Inspect Brake Lines and Components

• Sub-steps:
  1. Visually inspect all brake lines for signs of corrosion or damage.
  2. Use a wrench to tighten any loose connections.
  3. If leaks are found, replace the damaged brake lines or fittings as necessary.

4. Brake Caliper Inspection and Replacement

• Sub-steps:
  1. Lift the vehicle and remove the wheel to access the brake caliper.
  2. Check the caliper for leaks and ensure it moves freely.
  3. If the caliper is damaged, unbolt it from the bracket and replace it with a new one.
  4. Reinstall the caliper and torque the bolts to manufacturer's specifications.

5. Bleed the Brake System

• Sub-steps:
  1. Begin bleeding the brakes from the furthest caliper (usually the passenger rear).
  2. Attach a clear hose to the bleeder screw and place the other end in a container.
  3. Have an assistant pump the brake pedal several times and hold it down.
  4. Open the bleeder screw to release air and fluid, then close it before the pedal is released.
  5. Repeat until no air bubbles are present in the fluid, then move to the next caliper.
  6. Ensure all calipers are bled and refill the master cylinder as necessary.