There should be a fuse for the brake lights. If the fuse is good always check the ground wire.
Brake switch.
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.
my Oldsmobile alero did the same thing. It turned out to be as simple as a blown bulb in my tail light.
probably the brake light switch on the pedal if none are working at all
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!
Check the brake light switch on the brake pedal
if turn signals are working , and brake lights not working, i would replace the stop light switch on the brake pedal
How about a malfunctioning brake light switch