two brake/taillights are out on

Hello,

Check to see if you are getting power to the socket. If you have power then it is bunt bulbs even though they look to be in working condition.
If you do not have power to the socket and the fuses are good then you have a short somewhere in the brake light wiring harness. You will have to trace the wires to find the short. It can also be a bad ground.
Here is a helpful article on how to check wiring:

https://www.2carpros.com/articles/how-to-check-wiring

I attached the wiring schematics for your reference.

Please let me know of any questions.
Thank you.