they are two different lights. replace the light that is malfunctioning, but check the fuses first. It's the cheapest way out.
possibly have a brake light out
Check your brake fluid.
I have the ZX5 2003 and when I did it I had to open up the trunk and go through the inside.
The kind in a can.
One or both your break lights are no longer working.
vss sensor
brake light and battery light is on
Where is the brake light switch for 2003 hd Chevy truck As far as I know, all brake switches are on the top of the brake pedal arm.
go to focushacks.com
If the other side is still working it is not the fuse. its more likely a bulb or loose wiring.
A problem has been detected with the Antilock Brake System It could be a fuse , a sensor , or some other problem As long as the red " BRAKE " light is not on in your dash you still have " normal " brakes ( it's just that the Antilock Brake System feature is not working )
You need brake fluid