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are your markers on though turing the day though
if it happens once your markers come on than a bulb can be crooked
you might also have a wire groundingout somewere you can use a multimeter to check that using the ohm meter and see if there is none to little resistance between any of the two points on the power sides also check if there grounding out by checking them with the ground
ok its happening when your headlights are on and you push the breaks trust me i know it dont make much sense but it really sounds like one of your taillights is shorting i hightly doubt its a sensor if its when your lights are on
check the brake light- taillight bulbs for proper conection if the conections from the bulb to the harness are touching in two spots it will cause theses kind of issues in other wordsif one side or the other is backfeeding it will cause them to do strange things like you might even have your dash lights flash dim to bright
i would say check the bulbs if you havent done i know it sounds too simple to be the problem but it normally is
let me know you dont have to replace them yet just check them you can remove one side and see is the other acts up and then try the other or get one bulb and try it on oth sides