The brake lights on my 2004 Chevy Colorado are not working. It has new bulbs and the fuse is not blown. What else could it be?

The brake light switch , usually mounted to the pedal bracket, is probably bad . If equipped with cruise and driving down the road, see if hitting the brakes disengages the cruise speed .

if all the brake light bulbs are ok it could be the brake light switch which is normally on the brake pedal hope this helps.also check if theres a fuse for your brake lights some vehicles do.

I had an issue like this one on a 2007 Colorado. I assume you mean the turn signal indicator inside the truck lights up. It was a bad bulb. think it was the turn signal bulb on the side that is lighting up. As for the gear indication being dim there is more than one bulb that lights them up and one may have blown. I hope this helps.

brake light switch may be bad

it could be a bad ground in the tail lights

check all your fuses if fuses are good check brake lite bulbs see if they are blown. if bulbs are good get a test lite see if you have power to the bulb sockets have friend apply brake pedal you test power going into bulb socket if you have no power brake lite switch behind brake pedal could be burnt out. p.s dont forget to check all fese relays when checking your fuses.

check the ground from the rear lights...

after u check all the bulb try to check the fuses if its ok change the brake light switch which is located front of the brake pedal

it is the brake switch on the pedal. the contact inside the switch is bad

I've replaced bulbs on my wife's '04 Colorado that looked fine, but weren't. By looking at them, they looked to be in perfect condition, but swapping them for a new bulb fixed the problem.