A simple solution to fix the problem could be to replace the brake light switch located at the top of the brake pedal assembly. This is a common issue with Legend's within this year range, most likely causing the light to stay on in the dash.
Here's a few steps you can take:
1. Gather your tools: you will need a set of wrenches, a screwdriver, and a replacement brake light switch.
2. Disconnect the battery: this is an important safety step to prevent any electrical shocks while you work.
3. Locate the brake light switch: the brake light switch is located at the top of the brake pedal assembly, usually held in place by a few screws.
4. Remove the old switch: Use a screwdriver to remove the screws that hold the old brake light switch in place. Disconnect the electrical connector attached to the switch by gently prying it loose with a small screwdriver.
5. Install the new switch: Position the new brake light switch in place, align the screw holes, and insert the screws. Tighten the screws to hold the switch in place.
6. Reconnect the battery: Reconnect the battery cable to the battery terminal.
7. Test the brake lights: Sit in the driver's seat and press the brake pedal. Check if the brake lights illuminate properly and if the dash light goes off when you release the pedal.
Note: If the problem persists after replacing the brake light switch, there might be an underlying issue with the wiring or the brake light circuit, and it's best to seek the assistance of a professional mechanic to diagnose and fix the issue.