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trail braking is where you apply the brakes with your left foot while still applying the gas with your right foot. huge benifit in corners where you need to slow, but dont want the weight of the car moving foward.
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I have always known trail braking as the simple act of staying on the brakes while entering a corner. Any application of gas and brake simultaneously would be more effectively tied to heel toeing. I have never been taught to use the left foot in applying brakes, however, I suppose there are different schools of thought.
At the Skip Barber classes I have taken they teach trail breaking extensivly. They have never tought it using the left foot. It is always tought as a right foot breaking exercise combined with learning how to "blip" the throttle for successful down shifting. You learn to break, at the same time rolling the side of your foot on the throttle to rev the engine as you downshift. Matching rev's so as not to unsettle the car while downshifting. Slowly releasing the break as you head toward the apex, rooling off the break slowly and applying the throttle around the apex, thuough the track out. (I think I explained that right). I don't follow how you can trail break with your left, and downshift in the above example.
http://www.getfaster.com/Techtips/Physics23.html
This is a cool article, explaining the benifits as well as the consequences of coming off the breaks too fast or carrying too much speed into the turn.
Anyway I'm still learning, but I like the technique tought by the Skip Barber Schools that I've been trying to master.
Dave