why does my Ford F-150 14th Generation (2021-2024) brake light stay on

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shocks.
• Safety glasses and gloves are recommended.

2. Inspect and Adjust Brake Light Switch

• Locate the brake light switch, usually mounted near the top of the brake pedal.
• Check for proper alignment; the switch should be fully depressed when the pedal is not engaged.
• If misaligned, adjust the switch position accordingly until it clicks into place.
• If defective, replace the brake light switch with a new one (ensure it matches OEM specifications).

3. Check Brake Fluid Level

• Open the hood and locate the master cylinder reservoir.
• Inspect the brake fluid level; it should be between the “MIN” and “MAX” marks.
• If low, top off with the recommended brake fluid type (DOT 3 or DOT 4 as specified in the owner’s manual).
• If the level is consistently low, investigate for leaks in the brake lines or calipers.

4. Test Brake Light Relay

• Locate the fuse box and identify the brake light relay.
• Remove the relay and test it with a multimeter to ensure it functions properly (check for continuity).
• If faulty, replace the relay with a compatible part.

5. Inspect Wiring and Connectors

• Visually inspect the wiring harness and connectors from the brake light switch to the tail lights.
• Look for frayed wires, corrosion, or loose connections.
• Repair or replace any damaged wiring or connectors as necessary.