The front brake rotors can warp and cause a vibration when braking. The rotors will need to be machined or in cases where they are worn to thin, replaced to correct this issue.
Car Problem Reports
Honda Civic Si Warped Front Brake Rotors May Cause Vibration When Braking
Honda Civic Si Problem
Average Mileage: 60,000 mi (30,000 mi - 90,000 mi)
Visitor, 2006 Honda Civic Si
I have had this problem shortly into owning my brand new honda civic si 06, when it rains my brakes just don't seem to work, I have about gotten in so many accidents its ridiculous honda tried telling me it was just abs and i wasn't used to it. I plan to take it up there tomorrow bc i cant take it anymore!
replaced pads and rotors