If the bulbs are good then the brake light switch is bad, it's on top of the brake pedal up under the dash.
You probably need a new turn signal switch. I have a '96 Monte Carlo and I had to replace the turn signal switch to get the brake lights to work. Thankfully I had a brother who knew how to take off the steering column and replace. Hopes this helps!!!
dot 3
Check the brake switch up under the dash on the brake pedal. Lie on the drivers floor, look up and then push the brake pedal with yoru hand and see if there is any kind of electrical connector that actuates the brake lights when you push the pedal in.
check the multi function switch. I hava a 96 Chevy Monte Carlo and I had the same problem . I changed the multi function switch and the brakes lights now work. the rear brake lights run thru the switch on the turn signal circuit. try it and see.
where is the vaccum canister located on a 96 monte carlo
As with all brakes, you'll need a wrench or ratchet and socket.
The dash light dimmer control could be in the off position or broken.
it is a regulater switch in the fuse box under the hood.
A coolant flush on a 96 Z34 Chevy Monte Carlo helps greatly with increasing the efficiency of the cooling system. It removes buildup and contaminants from the system.
look in your owners manual if you have it.
96
It's buried under the washer bottle.