Have you first checked the fuse, that's the first place to look. The second place if the fuse is OK is the brake light switch and that;s on the brake pedal bracket, check the wires and just press the brake pedal and listen to see if you can hear it working, someone to look at the lights is helpful.
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.
Check the bulbs - they are doubloe filamented with the smaller being for brake/turn signals Check the fuses
Check the switch on the brake pedal
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.
On a 1999 GEO Tracker, a bad fuse can cause the headlights and dash lights to blink. A bad voltage regulator or alternator can also cause lights to blink and flicker.
Blown fuse, both lights are burnt out, There is a wiring or ground issue.
burned out bulb, blown fuse, wiring
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.
brake light switch would be most common cause
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.
Bad switch, bad relay, short to ground in the circuit.
BAD BRAKE LIGHT SWITCH AT TOP OF BRAKE PEDAL
Possible ground issue at the taillights.
Blown fuse or defective brake light switch.
Most likely a fuse.
The most likely cause is a bad brake light switch (if none of the brake lights illuminate) but if its only one of the brake lights, try changing the bulb. Even if they still work as running or turn lights because they have a double filament and may still work partially, but not as brake lights.
The most probable cause is that the brake light switch is out of adjustment.
Nonfunctional Brake LightsOne possible cause of this issue is that the brake light switch is not adjusted properly, or the switch could be defective.
If the brake lights & horn are on the same fused circuit the most likely cause of the problem is an open circuit before the fuse.