Bring to a shop that has an ABS scanner to determine the problem
Problem with the ABS (Anitlock Brake System). Take it to a professional for repair.
The left brake light works the right brake light doesn't and the bulbs is good
change the light bulb,
Check to see if the brake fluid level in your brake master cylinder ( in your engine compartment ) is low , if the brake fluid level is low or your parking brake is on the brake light in your gauge cluster will come on
Check the brake light bulbs, Check the brake light fuse, Check the brake light switch, In that order.
It could be the brake pedal switch or the rear light cluster circiut boards
From the Ford Dealer
There is a problem with the Anti-lock Brake System if the warning light stays on ( as long as the red BRAKE light in your gauge cluster is not on , you still have " normal " brakes )
You have blown a fuse, look for an acc. fuse out.
Are you sure it was the ABS light and not the Brake light? The Brake light indicates a leak in the system. The ABS light indicates a sensor gone bad.
A short, water getting in the light socket. exc.
you will have an earth connection in that light cluster loose, or broken, just have a look. JSL