A couple of years ago, I ordered a couple of red LED bulbs for the brake/tail lights on the bus from superbrightleds.com. They seemed to work fine when I installed them, but lately I had people tell me my brake lights would come on randomly. I even noticed that parked in the garage, if I turned the key, my brake lights would be on without turning on the lights or hitting the brake pedal.

Thinking that a bulb is a pretty simple thing even if it's LED, I thought I might have electrical gremlins causing my lights to go off. After all they shouldn't be on without voltage applied to them.

Before digging too deep though I swapped the LED bulbs out for traditional bulbs and the problem went away. Brake and tail lights work just as they should.

I guess I'll keep them that way from now on, I was hoping the LED bulbs would be brighter and more visible but it's no good if they are just going on and off randomly.

Brake light switch is fine. When I swapped in the regular bulbs, it all worked again.

LED's take less energy to "glow" than a bulb, your brake switch could be grounding just enough to light the LED's but not the bulb, since the filaments have to heat up to glow...
I think I'm right in this...
KC

What he said. Sounds reasonable.

Time to pull out the free multimeter from harbor freight!

You might need to add a resistor to the circuit so that "off" is really "off".  We made some stink bug traps 2 months ago and the cheapo l.e.d. tap lights that we used are still putting out light even though they've been on for 2 months straight.  Granted, they aren't bright but they're still on.

Oh, and clean your grounds.