i am new to this so bare with me. i have a 04 s80 t6 volvo and i was driving on the freeway today and had my cruise control on and i had to slow down so i put on the brakes and they were really hard and didn't want to press down so i thought it had to do with the cruise control because i noticed it only while it was on but it did it 5 times in the little amount i was driving and 1 of the times was with the cruise off so i guess that isnt it; it wasn't bumper to bumper traffic either so i wasn't over using them. does anyone have any suggestions on what it could be?