my Tesla Model S Plaid/Refresh (2021-present) has a hard brake pedal what should I check

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.

2. Check Brake Fluid Level

• Open the front trunk and locate the brake fluid reservoir.
• Inspect the fluid level; if low, top off with the manufacturer-recommended brake fluid (usually DOT 3 or DOT 4).
• If the fluid is low, check for leaks.

3. Inspect for Leaks

• Visually inspect brake lines, calipers, and the brake booster for any signs of fluid leakage.
• If leaks are found, replace the damaged lines or seals.

4. Test Brake Booster

• With the vehicle off, pump the brake pedal several times to deplete vacuum pressure.
• Start the vehicle and check if the brake pedal becomes softer as the brake booster engages. If it remains hard, the brake booster may need replacement.

5. Replace Brake Booster (if necessary)

• Disconnect the negative terminal of the battery to avoid electrical issues.
• Remove the screws or bolts securing the brake booster to the firewall.
• Disconnect the vacuum line and any electrical connectors.
• Install the new brake booster by reversing the removal steps and ensuring all connections are secure.