A few posibilities are. the bulbs have blown, although the side and brake light
bulbs are the same bulb, they use separate filiments,
The fuse has blown or the brake light switch is faulty.
probably the brake light switch on the pedal if none are working at all
Where's the fuse situated for brake lights on a Peugeot partner 1998
Yes if the wire is part of the brake lamp switch
Check the fuse
Have you tried brake light switch located on brake pedal or in that area?
Check bulbs, fuse, bad ground, brake light switch.
in dash lights
Bulbs may be burnt out.
Is the light bulb inside burnt out. If so, that would do it.
In the fuse box
Bulbs? Sockets? Steering column switch?
Blown fuse. Your brake lights don't work either.