check for a loose ground wire
tap the foot-brake lightly
Are your brake lights out - usually it's a fuse for the brake lights.
There are two elements in some bulbs. One element is for the tun flash, the other is for the brake or taillight. I also failed to mention that they are single element bulbs. It's 1 bulb, single element. It controls both the brake light and the turn signal. The turn signals work fine on both sides but no brake lights when I apply the brake.
the alarm
It is important to know what the warning lights mean on a dashboard. The ABS lights flash on any vehicle when there is an issue with the brake system.
a malfunction of the hard drive to send signals to the processor
Replace the flasher relay if the lights come on but do not flash.
It depends on the car. Some cars require that you turn on the turn signals to make the 4-way flasher work. If that's the case with your vehicle, make sure the emergency flashers aren't on. Otherwise, it's probably a problem with the turn signal switch.
If you just barely touch the brake pedal the brake lights will come on but the brakes will for all intent and purpose not be applied.
If the lights come on but do not flash, replace the flasher relay. If they will not come on check the fuses.
It can be connection wires, bulbs or fuses.
Usually this tells you that 1 or more lights are burnt out.