if you have disc brake on the back its your caliper, it might be not releasing and if you have drums on the back a part might be broke or come off.
Changing the brake light switch in your Chevrolet Monte Carlo is quite simple. The brake light switch simply plugs in and out.
.The 2000 Chevrolet Monte Carlo brake caliper bolt size is 9/16. The brake caliper bolt can be purchased at most auto-parts stores
My rear window brake light works, but not my tail light brakes on my 1997 Monte Carlo. What is the problem?
dot 3
Brake light switch on the brake pedal is defective
It should be in the fusebox with the rest of the fuses.
on top of the brake pedal under the dash.
check your break fluid.
ratchet or socket
carefully
If your 98 Monte Carlo brake lights do not work when you hit the brakes, but the top one behind the glass works, check the bulbs. If the bulbs have burn out, the lights will cease to work.
If the bulbs are good then the brake light switch is bad, it's on top of the brake pedal up under the dash.