Will a bad turn signal flasher keep the brake light from working?

A bad turn signal flasher typically won't prevent the brake lights from working, as they operate on separate circuits. The flasher is specifically responsible for the turn signals, while the brake lights have their own switch and wiring. However, if there's a more extensive electrical issue or a shared ground problem, it could potentially affect both systems. It's best to troubleshoot each component individually to identify the exact cause of any malfunction.