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
my Oldsmobile alero did the same thing. It turned out to be as simple as a blown bulb in my tail light.
Bulbs blown, or corroded sockets.
turn signal switch needs replaced!
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.
Check the brake light switch on the brake pedal
Check the bulbs, the fuse and the brake light switch.
Check bulbs, fuse, brake light sensors.