It looks like the brake lights / turn signals have one of the fuses in common : In the fuse panel located under and to the left of the steering wheel , by the brake pedal , FUSE # 13 - 20 amp - for STOP LAMP SWITCH ( LAMPS ) , TURN / HAZARD FLASHER , and speed control module
have you checked your fuses?
Blown fuse or bad headlight switch
You probably need to replace your brake light switch. It's near the top of the brake assembly, beyond a trim panel. The fact that all three brake lights don't work rules out problems in the multifunction switch (the cause of similar problems affecting only the two rear lights.)
If the brake lights do not work on Chevy Venture van 2000, try to disconnect the brake switch. Then short the two contacts of the connector to check if the brake lights are now working.
check the fuse, brake lights have their own, & check the brake switch at the top of the brake pedal
Check the brake light switch first. It is usually near the brake pedal under the dash. A bad turn signal switch can also cause this if the brake lights are also turn signal lights. If the brake lights are independent of the turn signals then disregard the switch problem. A good wiring diagram will help to diagnose the problem also. Check with dealership mechanics as they have access to diagrams.
Check the brake light switch on the brake pedal
Check the brake switch at the pedal.
Often these are accessed thru the trunk; have you tried that?
check the brake pedal, there is a switch on the back of the pedal that depressed when the brake is depressed that turns the lights on, when this is loose it keeps the lights on.
If you mean the brake lights are stuck on, then check the stoplight switch located on the top of the brake pedal.
Underhood Minifuses control the items in question. Fuses should be labeled, but if not you're on your own. BRAKE (Blue 15a) control brake lampls; HAZARD (Red 10a) controls Hazard Flasher, Inst Pnl, Turn Signals, Park/Turn lts and Rear Tail lts