So anyways whenever I go to drive my 8 after a put the e-brake down and start to reverse I hear a little POP from the rear. At first I thought maybe there was a small chunk of ice behind my tire but this wasn't the case. It sounds like maybe the e-brake isn't disengaging until I start to reverse. Could this be caused by it rusting from sitting or what?

 

brake self test
happens when they get wet (in you case, the snow)
it's normal, mine does that every time after I wash it. (In SoCal, it's about the only time it gets wet)

 

I always think the pad rusts to the rotor instantly

 

Ok good. That's what I assumed but I wanted to make sure since I never noticed it in my other cars.

 

As others have said, its normal! yay lol.

 

RX-8 > 'other' cars.