Brakes doing wierd things
I've got a 2004 Honda Civic coupe with 89000 plus miles on. Went on deployment and had it shipped, was in storage for three months. Came back to it, and the brakes 'slip' sometimes (brakes still work, i just have to press down more than I remember). I've looked at the brakes themselves, seem to be okay (rotors aren't broken or cracked, brakes aren't worn down hideously). A friend of mine thinks I'm being paranoid, but the guy I bought the car from sold it to me with aftermarket brake pads and three of the four rotors cracked, and my brakes going out unexpectedly at sixty on the freeway isn't an experience I want to repeat.
So: Is 'slipping' this normal, and if so, how do I fix it? Thanks.