There's a switch under your dash hooked up to your brake peddle
SOURCE: 2003 silverado 1500 v-6 brake lights dont work
ljones, Did you check the "VEH stop" fuse in the left side instrument panel fuse box. There are 3 stop light fuses, 1 for all the stop lights located in the under hood fuse box. 2 in the left side IP fuse box. 1 for the upper stop light and 1 for the lower stop lights. The fuse box in the IP is where the upper and lower stop lights split. Let me know.
SOURCE: 2007 Hyundia Sonata Brake Lights
There was recall for the 2006 and 2007 Hyundai Sonata Brake Light Switch assembly. www.promanuals.net
SOURCE: 2003 Impala Brake lights dont work
The brake lights are routed through the signal light switch.
Looks like that will be the next switch to replace and the problem.
SOURCE: Brake lights don't work. Replaced bulbs, checked
Yes, you need to of course check the voltage coming into and going out of the brake light switch, if 12 Volts are there going out and coming in while pressing on the brake pedal, your brake lights aren't getting a good ground or there is a break in the circuit between that switch & the lights.
On occasion the tail lights will work with a weak ground circuit where the Brake lights won't. Best way to determine this is to just hook up the 12 volt tester to the Brake light hot wire & there at the bulb ground, then in an area away from the bulb that has a good possibility of contact/ground.
Really that's it, if the 12Volts is getting to the bulb but it isn't lighting, if you aren't getting the voltage there and the brake switch is hot on both sides when pressed, the break in voltage will have to be traced from that switch to the tail light to find the problem.
good luck.
SOURCE: brake lights dont work
Check the brake light switch, it is down on the brake pedal lever, you can dis-connect the wire connector at the brake light switch and check for broken wires at the connector, and then jumper the connector with a paper clip, if the brake lights come on then replace your brake light switch.
There might be more than one switch attached to the brake light pedal lever, the brake light switch usually only has two wires going to it when there are two switches.
If there is no problem with the brake light switch then you can suspect the turn-signal switch to be at fault, as all of the running lights, turn-signals, brake lights, and hazard lights are all ran through the turn-signal switch. You can also try stepping on the brake pedal and wiggle around the turn-signal switch and see if the brake lights flicker or come on.
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