Check the bulbs - they are doubloe filamented with the smaller being for brake/turn signals Check the fuses
The BOO (Brake On/Off) Switch may need to be replaced. If it is bad, it would cause the brake lights to NOT illuminate when the brake pedal is applied.
Check your brake light switch at hte brake pedal.
A bad ground wire is the most common cause of turn signals and brake lights not working. The ground wire connection might be corroded.
Blown fuse, bulb, or bad brake light switch.
Check the bulbs, fuse & brake light switch on the pedal.
It is your multifunction switch that has gone out. It is located in the steering column. I used my emergency lights and it blew out brake lights, turn signals, and emergency lights. In newer models Chevy did a recall not so for our older models. Mine is a 1995.
The probable cause of the brake lights not working on your Renault is the brake light switch. The brake light switch can be found under the dashboard by the foot pedal.
burned out bulb, blown fuse, wiring
Blown fuse, both lights are burnt out, There is a wiring or ground issue.
A malfunctioning brake light and flasher relay switch will cause the brake lights and flashers to stop working. The relay switch can be found below the dashboard on the drivers side of the passenger compartment.
If the turn signal is working it's either the brake light switch or the turn signal switch.
Do you mean What does it mean when the brake and battery lights come on in when it is already started? Check your alternator may be its not working well it cause the battery sign comes out.