My son had the same problem on his 1995 Monte Carlo. The brake light in rear window worked , as did the tail lights and emergency flasher but no brake lights came on when pushing the brake pedal. Anyway , the problem was in the turn signal switch. This involved taking the steering wheel and column apart , taking the airbag out ( careully ) and it was more than I wanted to handle. The mechanic charged 227.00 including part and labor. .
Check the circuitry to the backup lights. The same fused circuit is probably used for both brake lights and backup lights. As you go past Reverse, the backup light probably is turned on briefly, causing the fuse to blow. It's just a thought, but I'd think it worth checking.
If the brake lights on a vehicle do not work on one side, this could be an indication of a blown bulb. Also, some vehicles have front lights that affect the rear lights, so checking for problems in the front lights could help as well.
I have run into the same thing with this kind of car. On the steering column at the top they have a switch that will turn the running lights on or turn them off. check the switch you may have hit it and turn it on.
The first thing that I would do is look at the arm of the brake pedal and make sure the arm is pressing against the brake switch, press the brake pedal with your hand and see if the switch head goes in. Also if you have someone with you have them watch the brake lights and use 2 fingers and press the head of the switch in and ask if the brake lights are on,it may be that the switch is bad. this would be step 1. depending on how old the vehicle is you may have a broken 12 volt wire or a ground wire, if your turn signals work and your taillights work I would first check the brake light switch. i have never seen 2 brake light bulbs go bad at the same time.
Could be a blown fuse Check the stop light switch usually located at the upper end of the brake pedal under dash are for operation and alignment Could be a blown fuse Check the stop light switch usually located at the upper end of the brake pedal under dash are for operation and alignment
brake light switch would be most common cause
fuse, bulbs
Possible ground issue at the taillights.
BAD BRAKE LIGHT SWITCH AT TOP OF BRAKE PEDAL
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.
More than likely it is the brake light switch that is attached to the brake pedal.
Check your brake light switch at hte brake pedal.
brake switch located on the top of the brake pedal
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.
Check the switch adjustment on the brake pedal arm.
Check the bulbs - they are doubloe filamented with the smaller being for brake/turn signals Check the fuses
Blown fuse, bulb, or bad brake light switch.