Fuse number 54
its a 2001 ford focus 1.6 petrol
S13 - 10amp
Back up lights.
Number 13 uses 10 AMP fuse
On a 2001 Ford Focus : The brake fluid reservoir is used for the brake and clutch systems
If the brake lights stay on that probably means the switch on the brake pedal that activates them is defective.
The brake light switch has failed
faulty brake switch
The most common cause for brake lights to be out on a 2001 Mustang GT is a blown bulb. There are some instances where there is faulty wiring.
See answer on "How do you change the front brake pads on a 2001 Ford Focus?" for a description of the location of the resivoir. The answer to this exact location is at the bottom of that answer.
check fuses, check brake light switch behind brake pedal.
It is not necessarily the fuse. It could be the switch on the brake that is not closing the circuit.