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Brake pedal you mean. Electrical short somewhere. Somehow power is flowing from the headlight circuit to the brake light circuit. Pull the fuse for the brake lights to see if they stay off, this may help you to isolate the problem. You have to trace the wiring (and test voltages along the way) with the help of the wiring diagram. It's possible corrosion somewhere is also the problem.
It may sound silly, but check your brake light bulbs to see if they have been installed incorrectly. Brake light bulbs have two filaments, one for tail light, and a brighter one for brake lights. On some cars if the bulb is installed wrong, the brighter filament will stay on for tail lights. The only other thing I can think of is the wrong bulbs have been installed.
Your cruise will not work if the brake lights are on just like the cruise disengages when you hit the brakes.As far as the brake lights with the headlights,sounds like there is something crossed.If you hold your breaklights on with your headlights off is there a glow of the headlights or your running lights.If your rear bulbs are the round push in and turn type make sure they are installes correctly.You may have one where the contact on the bottom of the bulb is causing a jump of power from your running/parking light over to the brake light side.Well hope this helps and good luck.
There should be at least 2 bulbs in the light assembly. One light is the light that is on when you turn on your headlights with out the brake pressed, the other light only lights up while you press on the brake. Make sure you are replacing the correct bulb. You may have been replacing the bulb that stays on. Your lights may be set up to turn off the light that stays on when the headlights are on while pressing the brakes.