2005 Chevy Colorado 2wd Brake Light Problems plz help!!

It might be the same bulb, but it is a separate circuit in the bulb socket. The brake and turn signals are on the same circuit and the tail lights are a separate circuit. A simple 12v test light can make tracing your problem simple. If you can unplug your circuit board and probe the harness that goes to it. Verify that you have there is power to the board for each function, if not, you have an issue in your harness and need to look further up, like at the split for left right and trailer plug.

Check battery voltage and ground at the tail lamp assembly . lite blue wire is battery voltage & black is ground . Does your vehicle have a trailer connection ? Check for corrosion in connection. , corroded ground - g105 splice pack G105
Ground splice pack in the engine compartment - left side inner fender near EBCM

Stop Lamps
The STOP fuse in the underhood fuse block supplies battery positive voltage to the normally open stop lamp switch. When the driver presses the brake pedal, the switch contacts close and battery positive voltage is supplied to the stop lamps and center high mounted stop lamp (CHMSL) which are grounded at G105.

https://www.youtube.com/watch?v=SO-eKuhCOqc

I have a 2006 Silverado that rear lamps have recently quit working. A turn lamp and backup lamp on opposing sides.

One was from loose socket contacts and the other was oxidation of lamp contacts. You can bend socket contacts closer to make them tighter and clean bulb contacts. It's been several weeks now and all is fine.

all brake lamps are dead.
and fuses are good. (did you check the right ones, or all?)
what about 3rd lamp?
if they look blown they are, why question that for $1 lamp.
replace lamps that are blown, the filament goes byebye.
fuse #9 is STOP, replace this on suspission
fuse that look ok, can have hair line cracks, we test them with a meter. so as not to guess...
next is this power 12vdc from stop fuse goes to the
stop switch and if stopping (foot brake) the output goes to 12vdc and all lamps on rear (stop)glow.
its cave man simple (unlike new cars that computers do all that)
now my advice, replace all 3 lamps
or take them out 1 by 1 and try them 1 by 1.
because lamps can SHORT and blow that fuse.
all there can be hand for $3,... and a new fuse for 50 cents.

I think your problem locating the fuse may be because Ford refers to the lights you are describing as "PARK" lamps, instead of "TAIL" lamps. The PARK fuse is Fuse #22 (15 Amp) located in the Smart Junction Box (SJB) in the center of the dash.

HINT: This same fuse also protects the circuits your front park lamps, if they are working, the fuse is not blown.

check your wiring harnmess and make sure bare wire is not touch other wire this will call to flown fuse.

check the fuses for a blown fuse

replace your brake pressure switch on the master cylinder and that should take care of your problem.

Both my rear brake lights went out at the same time. o7 chevy colorado. What are my options?

If you put the tail gate down, there is 2 screw (phillips) that holds the tail light in place. Remove them & you can twist the bulb out. Thats it, put back together in reverse. Hope this helps.