my BMW X5 G05 (2019-2024) has a hard brake pedal, what could be wrong?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and engage the parking brake.
• Disconnect the battery to prevent electrical issues.

2. Inspect and Replace Brake Booster (if necessary)

• Tools Required: Socket set, torque wrench, brake cleaner.
• Sub-steps:
  1. Remove the engine cover if applicable to access the brake booster.
  2. Disconnect the vacuum line from the brake booster.
  3. Unbolt the brake booster from the firewall (typically 4 bolts).
  4. Carefully remove the brake booster from the vehicle.
  5. Inspect the old brake booster for damage or leaks, and compare it with the new component.
  6. Install the new brake booster by reversing the removal steps, ensuring all bolts are tightened to the manufacturer’s torque specification.

3. Check and Replace Master Cylinder (if required)

• Tools Required: Wrench set, brake line wrench, new brake fluid.
• Sub-steps:
  1. Remove the brake lines from the master cylinder using a brake line wrench to avoid damage.
  2. Unbolt the master cylinder from the brake booster.
  3. Carefully detach the master cylinder and inspect the seals for wear or damage.
  4. Install the new master cylinder and ensure it is properly aligned.
  5. Reconnect the brake lines and tighten them securely.
  6. Fill the master cylinder reservoir with fresh brake fluid.

4. Final Checks

• Bleed the brake system to remove any air that may have entered during the process.
• Reconnect the battery and start the vehicle.
• Test the brake pedal feel to ensure proper operation.