if you have no brake lights it will most likely be one of 3 things a blown fuse bad ground wire or under the brake pedal you will find a small switch that the pedal hits when you press on the pedal the switch does go bad but is easily replaced and usually not too expensive
If you have the same bulb for brake and signal, brake light power needs to be interrupted by the signal lights, The brake circuit has to go through the signal light switch so the problem could be there.
if its burnt out, replace it, if not, check the wireing
check brake light fuse and brake light switch on pedal
i would try changing your bulb in the rear of the car first then if it still not working then look for fuse or wiring problem
May be stop light switch--usually located at the upper end of the brake pedal under dash
Check the brake light bulbs, Check the brake light fuse, Check the brake light switch, In that order.
the brake light driver side not working
The brake lights in your 1983 Nissan pickup truck are controlled by the brake light relay switch. When the brake light relay switch malfunctions the brake lights will stop working.
probably the brake light switch on the pedal if none are working at all
There should be a fuse for the brake lights. If the fuse is good always check the ground wire.
Bulbs blown, or corroded sockets.
If you brake lights are not working on your trailblazer it could be due to a number of reasons. Your fuse could be blown, or your light may no longer work.
turn signal switch needs replaced!
How about a malfunctioning brake light switch
if turn signals are working , and brake lights not working, i would replace the stop light switch on the brake pedal
Check the bulbs, the fuse and the brake light switch.
Check bulbs, fuse, brake light sensors.