I have a 2009 Chevrolet Colorado and my rear brake lights are not working. My brakes work but not my rear lights. Tried replacing bulb but that wasn't problem. Hopefully someone has some answers.

first check the brake light fuse it powers the rear bulbs.
remove and verify that all bulbs are working. note the wire colors going to the bulbs. replace as needed.
next check the turn signal switch. if broken replace.
sometimes switches break on the inside so measure from the power lead to the outputs. The wires going to the bulbs. easy because they are on the bulbs you checked.
if you have towing package there will be a connector to hook up lights on the trailer. Inspect for bare wires or cuts in the insulation.
good luck

u got a shortage some were u r gonna he to wire them into the other brake lights its pretty easy to do and it wont affect the car in any way try that

Sound's like its just a bulb problem, just make sure that you replace it with the correct bulb,,,

try replacing the bulbs and put some electical grease on them before putting them in, could have condensation on them.

I have this exact same issue with my 05 Colorado and its so annyoying (not to mention unsafe)... I thought it was just the blub- becuase in my case my signal is no loger blinking. My break light still works, as does my parking light...

Any thoughts as to why this is happening?

Please HELP!!!

Look above your brake pedal and you will see your brake switch up along your brake pedal arm. It will either be between the brake arm and the firewall so when you brake it pushes the switch in. Or it will be between the dash and the brake arm so when you brake it pulls the switch out. Most likely this switch needs to be replaced

The problem is in one of two areas. Either the brake light switch near the brake pedal is faulty or your ground is poor. Unless you are mechanically inclined the best and cheapest way to solve this is to go to any autoelectric shop. You can find them in the yellow pages under autoelectric.

check the ground from the rear lights...

On the truck, are the turn signals and the brake lights using the same bulb, if the brake lights are using a different bulb the trailer might not work withe the truck if it only has a 4 wire plug, might have to add brake lights to the trailer and use a 5 wire plug, yes this means rewiring the trailer and adding 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