When the passenger side turn signal is activated all rear brake lights blink too

Hello, sounds like you may have some kind of wiring or electrical issue related to the turn signal switch, headlight switch, brake light switch, or the lamps themselves. Someone skilled in checking wiring should be enlisted to determine why the power is being sent to illuminate the bulbs that should not be lighting up. Here is a link to some folks near you that may be able to help -- and good luck! http://repairpal.com/toyota-within-10-miles-of-new-york-new-york-10178

Start looking in rear harness, for a short to hot wire. trace harness from operating signal towards the affected lights. May save money, in the long run, having someone experienced in auto electronics, find this for you, as one little mistake could cost hundreds, if not thousands.