my BMW X3 G01 (2018-2024) has a hard pedal feel when braking what to do

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the ignition is off.
• Wear safety gloves and goggles.

2. Inspect and Replace Brake Fluid

• Tools Required: Brake fluid bleeder, funnel, and container for old fluid.
• Sub-steps:
  1. Remove the cap from the brake fluid reservoir.
  2. Check the fluid for contamination; if it appears dark or dirty, proceed to replace it.
  3. Use a brake fluid bleeder to extract old fluid from the system.
  4. Refill with new brake fluid as per manufacturer specifications (DOT 4 recommended for BMW).
  5. Replace the reservoir cap securely.

3. Brake Booster Inspection

• Tools Required: Vacuum gauge (if testing for leaks).
• Sub-steps:
  1. Locate the brake booster; it is typically mounted on the driver's side firewall.
  2. Inspect the vacuum line for cracks or disconnections.
  3. If available, connect a vacuum gauge to the brake booster to check for proper vacuum levels.
  4. If the booster is faulty, unbolt it from the firewall and replace it with a new unit.

4. Brake System Bleed

• Tools Required: Brake bleeder kit or helper.
• Sub-steps:
  1. Start from the wheel farthest from the master cylinder (usually passenger rear).
  2. Attach the bleeder kit to the brake caliper and open the bleeder valve.
  3. Have an assistant press and hold the brake pedal down.
  4. Close the bleeder valve, then release the brake pedal.
  5. Repeat until no air bubbles are present in the fluid.
  6. Move to the next wheel and repeat the process until all brakes are bled.