replace the relay under the hood
Also check brake lights switch
had the same problem switched bulbs and worked fine
wrong bulbs or bad earth
It would either be a bad wire in the circuit from the brake light switch on the brake pedal to the bulbs, OR the bulbs have 2 filaments in them and the one that comes on when you apply the brakes are worn out, OR someone put the wrong bulbs in(single filament). I would change the 2 bulbs first.
my guess is that it is the brake relay
I had the same problem withj my 2003 Silverado - change the alternator..it worked for me.
there is two rods that go through the housing from the top. turn them to unlock and pull up and out then the whole assembly comes out and you can change the bulbs.
The brake indicator light tests continuity to your brake lights and activates if continuity is broken. This means one of the bulbs is out or there is a problem in the wiring to the lights. The light also comes on when you start your car and stays on for a few seconds along with the flashing "check" signal on your dash. If you wait or push the check button above your rear view mirror the lights should go out. If the brake indicator light doesnt go out check your brake lights and make repairs if necessary. The light should function correctly after the bulb is replaced or wiring is repaired. If not you may have a malfunction in your active check control system wich is behind the panel of lights above your mirror.
It has been my experience that when the blinker comes on but the lights don't blink there is one or more bulbs burned out. If that is not the case check the flasher.
Short in wires or wired incorrectly.
There are two screws in the tailgait jamb, just remove them and the lense comes right out exposing the bulbs.
The head light switch is shorting out ,or a bad connection
Please re-phrase your question; it appears you are saying the brake lights come on when you push the brake pedal and the lights are working (normal operation). If the lights are staying on after you release the pedal, then the problem is with th brake light switch (sticking). Thanks Malcolm
well i had the same problem on my da check your brake switch its located on the bottom of the brake pedal