2008 Road King with ABS brakes. When I press the rear brake pedal, the brake lights do not come on. They DO come on when I pull the front brake lever. The running lights and turn signals all work properly. No blown fuses or blown light bulbs.

>moved to Motorcycles<

I'm sure there are some folks here that can help you, but this is the "Home & Garden > Electrical & Lighting" forum; as in construction and building electrical.
You'd probably get much more thorough help at an automotive or motorcycle forum.

It sounds like the switch on the brake pedal is either adjusted incorrectly or is not working. That would be where I would start.

Start at the rear brake switch, if you jump it and it works, switch may need to be adjusted as mentioned by odinn7, if you jump the switch and it doesn't light, it is further in the circuit.(where it ties in with front brake switch.. ) If it has a security Module of some type, front and rear may not tie directly together?