Brakes problem
1995 Toyota Camry 4 cyl Two Wheel Drive Automatic 102600 miles

I brought this car used in May of 2008 with 98,500 miles. I replaced my brakes when i got the car. I had 2 oil changes and had all my fluids flushed and put back in with new oil, braking fluid, and power steering at 101,600 miles (1,000 miles ago). I just had 4 new tires put on my car and also a wheel alignment done. Now all of a sudden when i press on my brakes the pedal goes all the way down and i will had to let go and hit it about 4 times for it to work. What is wrong with my brakes?.....Thank you for you time and advice.