test brake lights
https://testbrakelightsnest.alderbrief.com/posts/how-to-test-brake-lights-safely-and-effectively-at-home
I was backing out of the driveway this morning and had my wife stand behind the car to test brake lights. A quick press of the pedal confirmed both sides are working, but the passenger-side bulb looks a bit dimmer than the driver's. Probably worth swapping that bulb soon before it becomes a safety issue.