So I know that I'm not suppose to use the rear brake on descents and this might be the reason why I have this problem, but I just wanted to sort this out. I have a tendency to use both brakes to slow down before turns and on prolong downhills, after a while, I start getting this squealing sound that sounds like a mini version of what you hear from semi truck's brakes The noise usually starts when I'm going 30 MPH and above and is sometimes accompanied with slight vibration that freaks me out at those speeds.
I've cleaned the rim and adjusted brake toe-in. This is on a stock 2010 Giant TCR Advanced 2 with Ultegra groupset and Mavic's Ksyrium Elite rims.
Any ideas what's going? Is this what happens when you brake with your rear at high speeds?