I have a 2005 g35, and i took off my rear brake pads on both sides, because i was supposed to change the rotors. When I'm driving the car there is a mellow grinding noise, when i press down on the brake it loudens. When i tried to take the rotors off they were stuck. I beat on them until they broke free. The parking brake was what looked like engaged. And I had to break it to remove. The noise is still there. ANy tips? The pads look alright, and the rotors.

 

Something's fu**y with the rear brakes. You need to be clearer and more detailed in your explanation if you want any real answers.

 

Maybe your slide pins are stuck, a common G35 issue and many mechanics don't regrease slide pins !

 

When i took off the back left rotor, it was stuck, because my Emergency brake pads where stuck to the rotor, and I had to break it off, to try and get the new one on. So that side is is maybe a lil bit better. But I know that you can disengage the e-brakes but if it hasnt been working for this long i want to just take it off. I need to get back and remove it, but even though i did on the left it still sounds horrible stopping

 

Judging by your description of using a hammer, I'm going to assume you didn't release the ebrake properly before trying to get the rotors off. Then didn't adjust them after installing new ones.

New ebrake shoes and hardware is like $30, so you can fix if something is actually broke.

You're supposed to release the ebrake lever (or pedal if auto) and loosen the nut that tightens the cable. Then at the rotor, pop that little rubber cover off and spin rotor so that hole is at the top. If you look inside you'll see a gear looking thing, this adjusts the shoes, you need to spin it with a flat head screwdriver so that the shoes loosen. Then the rotor will come off easily.
After you install a new rotor, adjust the shoes so they stop the rotor from spinning, then loosen them a few clicks so the rotor spins again. Then tighten down the cable nut in the hand lever so that there's good tension when you pull up and the ebrake engages.

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^ This.

Rebuilding the e-brake set up is not that difficult and depending on your usage of it may be a more frequently suggested maintainence procedure.