after replacing all of my brakes (2 months ago) on my 95 toyota corolla...i have noticed it feels very soft as if it has air. Everytime i brake it feels as if it goes all the way in and does not have so much brake power...what might be the problem? are the brakes positioned wrong? should i need new brake lines installed? or is it normal to feel this after replacing your brakes ( 2 months ago)?