You MAY have a couple of problems here and I've experienced them all on my 2000, but first things first. Check your brake switch wiring harness next to the fender under the dash (where the wire is too short and may shortout). Make sure it's not burnt, or you'll be chasing this forever like I did. If it is, replace the pigtail up there. If that is ok, jiggle your hazzard light switch and see if they start working again. If they start working, replace your hazzard light switch. If it's not that, it's your multifunction switch. Your lower brake lights run through the multifunction switch.
This same problem has affected many people, you're not alone.
SOURCE: turn signals and hazard light not working
Sounds like the falsher unit itself is bad.
Looks sort of like a small relay, in the fusebox. Turn signals and emergency lights use the same flasher.
SOURCE: 99 Chevy Tahoe... Rear turn signals, brake lights, and hazards
I had this problem, and to be honest, it happened to the left side about a week later...it's the board that the bulbs plug into...it's a very common problem with this model. So popular that you can normally get the socket board off the shelf at a parts store! it's extremely simple to replace, and I replaced all the bulbs at the same time!
SOURCE: 2001 GMC Jimmy break lights not working but all
Check the brake light switch should be a orange wire with 12v then a white wire with 12v when the pedal is pressed.If htat cks good then ck the hazard switch by moving it up and down and wiggeling the knob with the brake pedal pressed if they start working then your multifunction switch is bad and needs to be replaced.
Testimonial: "We check and you were right on the money. It's the hazard switch carrier. Thanks for you help."
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