my BMW X5 G05 (2019-2024) has a hard brake pedal what's causing it

Solution

1. Preparation

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

2. Inspect and Replace Brake Booster

1. Remove the Brake Booster:

   • Disconnect the brake lines from the master cylinder using a line wrench.
   • Remove the mounting bolts securing the brake booster to the firewall using a socket set.
   • Disconnect the vacuum line from the brake booster.
   • Carefully pull the brake booster from the vehicle.

2. Install New Brake Booster:

   • Position the new brake booster in place of the old one.
   • Reattach the vacuum line securely to the brake booster.
   • Reinstall the mounting bolts and torque them to the manufacturer’s specifications.
   • Reconnect the brake lines to the master cylinder.

3. Bleed Brake System

1. Prepare for Bleeding:

   • Refill the master cylinder with fresh brake fluid of the correct type.
   • Ensure there are no air bubbles in the lines.

2. Bleed the Brakes:

   • Start from the wheel furthest from the master cylinder (usually the right rear).
   • Use a brake bleeder tool or have an assistant pump the brake pedal while opening and closing the bleeder valve until no air bubbles are present.
   • Repeat the process for each wheel in the correct order (right rear, left rear, right front, left front).

4. Final Checks

• Reconnect the battery.
• Start the engine and check for proper brake pedal feel and operation.
• Test drive the vehicle to ensure proper braking performance.