I agree with Dwight, but would add that "late apexing" also allows you a longer view around the turn, and that your speed should be no greater than the distance required to stop within your view of the road. So, if you are going into a turn that you can only see 200 feet of (before you lose sight of the road), then your speed should be no greater than what it would take you to stop in 200 feet.
You can apply brakes during a turn, but on wet and oily roads this really limits you. On dry roads and in a turn I will only brake with my front (if needed), but then I try to brake with my front almost all the time. Under most conditions I only use my rear brakes when I absolutely have to. If the road is oily or has gravel/sand then using the front brake will create problems. At this point just try rolling off the gas slowly, and counter steer more.
It is best to be at a speed just prior to entering the turn that allows you to slowly accelerate through the turn, thus pushing your rear tire into the turn. When you brake with your rear, the rear tire will lift, because you just transfered most of your weight to the front, which makes it easier in a turn for the rear wheel to lose contact with the road. Letting off the gas in a turn will transfer weight forward also, so if you feel you need to roll off the gas slowly.
Tom
