i drive a 2005 hummer h2. Lately my brakes have been harder harder to engage. I push the peddle and usually i dont have to apply that much pressure to stop. I have had my brakes replace with top of the line pads and the problem still continued. Then i got mymyster cylinder flushed to see if that was the problem...... do you think it is the Brake Control Modulator????? HELP!!!!