We recently had to replace the lens (no bulbs) for one of our tail lights. The light worked fine until we replaced the lens now it does work when the lights are on, but when we actually brake it doesn't work. On the dash the "rear lamp" indicator is on.
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there must be a short circuit which powers tail lights and brake lights. probably you have a dual filament bulbs which have both brake and tail light together. check for bulb, socket/or bulb housing and harness of that light.
If the high level brake light works, then the brake light circuit is fully functional.
Brake light bulbs may LOOK fine, but can still have failed. Often folks don't notice that one bulb has failed until the second one has blown; it's then easy to incorrectly assume that the fault is more complex.
Try replacing the brake light bulbs: if that doesn't work then please report back for additional options.
I would start by trying another bulb. Even though the brake and tail light share the same bulb they actually are powering different filaments inside of the bulb so you can have a tail light filament that is working fine and illuminating properly but have a burned out brake light element that won't work at all...all inside the same bulb. Not uncommon at all to see this problem and these bulbs are pretty inexpensive.
Access to the brake light bulb is through the tail light lens.
First, remove the tail light lens by removing the single star shaped screw that secures the lens. You do not need a special screwdriver or bit: a regular flathead screwdriver will work fine.
most rear tail lights and turn/stop lights are the same dual filiment bulb. it is possible for your tail light to work and your brake light not to and still have a bad bulb. I would check the bulb first, your brake light works on the left yes? this would mean that the fuse is fine
The tail light works but not the brake light? The bulb is burned out this is a two phase, or function tail light one for running lights the other brighter one is brake lights. Simply replace the bulb and this SHOULD fix it. Good Luck