I have a 2003 yukon Brake lights are not working. I have replaced the brake switch. Its not the bulb or the fuse. What else should I check? Please help

SOURCE: 98 gmc suburban brake lights

One of two things cause this corroded or poor chassis earth at the bulb holders or the circuit board that holds the bulb is faulty.

SOURCE: brake lights/rear turn signals

I had the same problem with my 1999 Yukon. The electric board needed to be replaced. Rust starts to build up and shorts out or blows the bulb. The dealership charged $73.60 for the part and I installed it myself (Saved $30).

SOURCE: Brake lights quit working.

if all fuses and bulbs are ok get to the brake switch and see ifits stiff or stuck, if it just has two wires on it you could join themtogether to see if the brake lights come on though obviuosly dont leave them joined.Good luck davelee

SOURCE: bottom brake lights and hazard lights do not come on. All other lights work including top brake lights. Fuses and bulbs checked.

Check for power out of brake light switch by brake pedal. Of its faulty , the 3rd brake light will still work. Hope this helps

SOURCE: 2003 Toyota Camry - Both Brake lights not working

Lok in the trunk on the left side, behind the carpet for a small plastic box with a bunch of wires going to it. Look to see if there is brake light powe coming in with the pedal depressed. If so, and no power is coming out, you need to order and replace the "taillamp failure sensor".