I bought a 2013 Trek Madone 2.1 about a month ago. The bike has been great, and I have about 300 miles on it so far. The only issue I have, is when braking downhill, the brakes will squeal after they warm up. On hills where I just lightly brake, no squeal. On hills where I need to fully stop at the bottom, the brakes squeal a lot near the end after they warm up. I have read some other reviews where people were mentioning the Madone's brakes weren't that good to begin with. Would it be worth upgrading the pads? If so, any recommendations?