Are you referring to the brake caution light on the instrument panel, or to the brake lights at the rear of the car? If you're referring to the brake caution light, on most cars that light will illuminate if the parking brake is set, if the brake fluid reservoir is low on fluid, or if the brake system detects unequal pressure in the brake lines going to the wheels (leak in one or more lines). You need to check all of these things.
If you're referring to the brake lights at the rear of the vehicle, and you've already determined that the switch is OK, then you may have a problem with having a good ground for the light assemblies, and the running lights are being grounded through the brake light filaments in the bulbs.
SOURCE: brake lights in rear will not work
Do you have a trailer plug? Look for corrosion around taillight plug under truck in the back, PULL IT APART to see if there is any corrosion. If you find none, than take the taillight housing out and run a external wire from a clean spot on frame to the ground on housing, it could be a ground issue. Did you test light the break light switch power in power out?
SOURCE: Mitsubishi Endeavor Anti brake light stays on
hi this maybe due to the brake switch being either stuck in or the switch itself has broken, if you look under your dashboard where the brake peddle is, you should see a black or white plastic thing being held to a small bracket, there should be a little plunger sticking out, if not, unplug the switch ( should be a 2 wire plug ) then undo the nut holding it in the bracket, and have a look and see if the plunger is broken or just stuck in, it could have some dirt holding it in place, just pull it back out and lubricate with a light oil, obviously if it is broken just purchase a new one....hope this helps please vote thanks
SOURCE: 2004 f150, my backup lights will not work, even with new bulbs, the fuse was good
check the neutral safety switch move the shifter around and see if the lights flash
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