Is it allowed for a vehicle to be driven on a public road when the brake lights are not working?

No, it is never permitted to be driven.
Yes, during lighting-up times.
Yes, outside of lighting-up times.
No, unless driving in a built-up area.

Explantion: A driver must always ensure that their vehicle’s brake-lights are clean and working correctly before driving on a public road. Never drive a vehicle when the brake lights are not working properly.

Theory Tester

Is it allowed for a vehicle to be driven on a public road when the brake lights are not working?

Legal Matters/Rules of the Road