I do it when I don't have to downshift under braking (which is rare at most tracks). It takes a while to get used to, but I used to practice when I used to daily drive a Nissan Titan which was an automatic. When I can do it on the track I prefer to. Every tenth of a second counts in time attack! Its mostly a trick for cars who don't require the use of a clutch to shift (R35 GTR, M3 w/SMG, most professional race cars with sequential transmissions, etc.) Its also good on turbo cars so you can keep the turbos spooled up. Left foot braking does tend to be harder on brakes though depending on how much you do it since there will be a split second where you are on the gas and the brakes at the same time.
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