I just noticed when i press the brake pedal all 3 brake ligths turn on really bright but some times the lights just turn on like half way really low wath could it be some problem with the pedal or the tail ligths or any electrical problem please help me and i just noticd thah my side marker ligth its blinking some times the one on the front drivers side any recomendations?

 

I had the same issue. It's probably the sensor for the brake light. I replaced mine and the issue has never occurred again.

https://acurazine.com/forums/3g-tl-problems-fixes-114/g-097-2004-need-help-acura-tl-3rd-brake-light-doesnt-work-716677/