01 grand prix gt. the tank reads its empty with the low fuel light on and it was just filled. it works when it wants and even when it does it will say like 3/4 tank when its full.
Also the e-brake light keeps coming on for a couple days sometimes it will go off but come right back on and the e-brake is not on.
anyone know wtf is going on?
Welcome to the lovely quirks of the W-Body 
the fuel tank problem is the fuel level sensor, there was a huge prob with those about 2 yrs ago due to the additives that was being put in the fuel. u need to pick up a level sensor ane install it on the sending unit in the tank. i suggest driving the car till u think is is almost empty cuz u have to drop the tank, i think.
but check the trunk, i cant remember which yr they got smart and added an access panel in there.
Sounds like a bad connection to the sender unit on the tank. Probably a corroded wire moving around which could cause that.
fuck i dont feel like taking the tank out
check the brake fluid. theres a check ball in there that will go on if fluid s low