I'm having a problem with my brakes. Sometimes when I try to stop my brakes will work fine when I first step on the pedal, but they slowly lose pressure. By the time I stop my foot is to the floor and I barely have any stopping power. I put new pads and rotors on about a month ago, but they were working okay until a week or two ago. Any help is greatly appreciated.

check for small leaks yet?

Not yet, haven't had time. I'm hoping i'll get a chance to take a look at it this weekend. Thought i'd see if anyone had any ideas though.