How to change my rear brake light

1) Open trunk
2) Remove small round plastic access panel with a flat tip screw driver by prying open
3) Remove flat tip screw holding tail light assembly
4) Remove tail light assembly by pulling outward, careful not to break plastic guide/nub
5) Disconnect wiring connectors
6) Remove plastic housing access plate on back of tail light assembly by twisting/turning tabs until they click and then lift access plate from tail light assembly
7) When viewing the the bulbs, the turn signal bulb is the bottom left bulb
8) Install in reverse order, ensuring tail light seal seats properly during installation

there is an access cover in the trunk.Open that and just pull the bulb fixture out replace the bulb and place back in the hole.

What you want to do is open the trunk and remove the fasteners that hold the trunk lining to the rear deck panel and separate the lining from the deck panel.Disconnect the lamp wiring from the wiring harness.Now you will see some nuts that hold the tail lamp to the lower deck and the quarter panel.Remove these bolts or plastic wing nuts and remove the assembly from the car.To change the bulbs twist the socket and pull the socket and replace the bulb.Just reverse the process to put it back in.

The easiest way is to open back trunk open any coverings or carpet pull it back to gain access to the bulb socket once you see the socket twist it counter clock wise and remove remove the bulb and replace with new one once installed have someone step on your brake pedal to confirm working then put upholstery back and you =have completed changing your brake light bulb.

How To Install Replace Change Taillight and Bulb 2000-04 Subaru Outback

Removing:

• Switch off all electrical consumers, switch off ignition key and remove ignition key.
• Remove rear luggage compartment side panel trim (left or right).

• Remove 3 nuts, arrows, and remove housing.
• Remove bulb holder.

Installing:

• Install bulb holder.
• Insert housing into body opening.
• Tighten nuts.
• Install applicable rear luggage compartment side panel trim.

Rear Light Bulb Holder Removing And Installing:
Removing:

• Disconnect electrical connector.
• Depress retainers, arrows, and remove bulb holder.

Installing:

• Install in reverse order of removal.

And the Center Mounted Brake Lamp.
High mount Brake Light Removing And Installing:
The high mount brake light is installed in the rear shelf.
Removing:

• Switch off all electrical consumers, switch off ignition key and remove ignition key.
• Disconnect electrical connector from high mount brake light.
• Remove rear shelf
• Un-clip high-mount brake light from rear shelf, arrows.
• Install in reverse order of removal.

NOTE: The bulb holder base plate contains soldered- in light emitting diodes (LEDs) that are not replaceable. In the event of LED malfunction, replace complete bulb holder.
Additional

Hi open the boot where the light cluster is there will be a panel covering the rear lights remove this, then you should be able to see the back of the light cluster, the plastic tray that holds the bulbs has 2 push in plastic clips just squeeze them together and the light panel will come free, then just remove the suspect bulb and reverse the process.

Hope this helps

Rear: Brake, Back-up, Tail, Turn signal (3 bulbs, all # 3157) To access the rear bulbs, open the liftgate and remove the two phillips head screws from the side of the housing. There is no 3rd screw. There is a metal rod with a ball tip which is stuck in a rubber socket on the vehicle. Slowly and firmly rotate the assembly away from the vehicle until it disengages from the ball pin socket that secures it in back. Rotating it away from the vehicle give you leverage to smoothly disengage the ball from the socket. Each of the three light sockets, all containing the same exact bulb type, can be removed by turning them counter-clockwise 1/4 turn.

OPEN REAR HATCH & TAKE TRIM OFF LEFT OR RIGHT SIDE & TWIST BULB HOLDER OUT OF BACK OF LIGHT

For the brake light open the rear hatch and check beside the tail light. I believe ther is 2 phillips head screws right where the light meets the rear hatch on the body panel. remove them and gently yet firmly pull the lens assembly from the corner of the rear body panel. Squeeze the clips on the back of the socket and twist to remove the socket from the lens. Push gently on the bulb and turn carefully to remove light from the socket replace the light and reverse removal procedure to install.