Okay, when I first got my car, I could very easily lock up my brakes if I wanted just by slamming them on. Recently I almost hit a van that pulled out in front of my while I was doing like 55 in a forty five and I slammed on the brakes. I had the pedal all the way down but the wheels were still rolling. I still stopped pretty fast but not as fast as I could. I used to have to be careful with the brakes and now I have to really stomp on them to get any stopping power out of them. However I recently fixed my E-brake and can lock up the rears quite easily, so I don't really think it's the brake pads, but I don't know much so I could be wrong. Do my brake lines need bleeding? Can air get in there if you're not actually messing with them? And if so is bleeding them something easy that I can do myself or should I have a pro do it? What's the best way to go about this?