Sorry I guess I should have been more clear... it’s a 2006 Ford Expedition it’s towing nothing. It’s my girlfriends vehicle and turn signals work fine, I replaced both bulbs, so I know it’s not them.
Unless the vehicle has amber turn signals, replacing bulbs was a waste of money - the same filament that is the turn slgnal is also the brake filament. If one works and the other doesn't, the problem isn't the filament in the bulb. I don't remember which type that vehicle has. Another hint is that rarely would 2 bulbs decide to fail at the same time. Look for something in common.
Check the brake switch on the pedal stem by removing the wiring connector and jumping the two contacts together (with the vehicle on/running).
Check the owner's manual to see where the brake circuit fuse is located and check that. If it's blown, don't be surprised if it blows again since they blow for a reason.
My bet is on the switch as a failure point.