My guess is that you stock pads are worn. I was tracking my car at thunderhill with about 10K when I had the same problem. High speed braking shook the car very badly. After I took the wheels off and removed the pads I realized that I must have cooked them the week before at laguna seca. A quick (well not so quick on the first side, second side went fast) pad replacement and the problem was gone. If you don't track you car you are right at the time where aggressive street braking could have worn you pads down to a few mm. Take a look at your brakes (without removing the wheels) to see how much pad you have left. My guess is you're below 2mm. If so all you'll have to do is swap out the pads. Easy to do yourself or just bring it to a local shop (not Honda, way tooooooo much $$$$). Pick up pads before you go. You can get some high performance street pads or just stock ones.

 

ABS, perhaps?

 

noone said ALIGNMENT!!!!

 

My car leans to one side if I slow down from maybe 40-0mph quickly sometimes. I only have 2500 miles though.