Why do racing drivers tap the brake before a corner?

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In a few racing vids I've witnessed drivers tapping the brake pedal a couple of times with their left foot whilst braking with their right foot before the corner.

Anyone know why they do this?

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I think it might be a little test to see if they've got any pedal. To see if the brakes are suffering fade?

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RobM77 said:

I'd like to answer this, as I race; but I don't understand the original post (tapping with the left foot whilst braking with the right - so two feet on one pedal?). In answer to the other comment yes, braking as you turn will use weight transfer to neutralise the car's steady state handling (usually understeer) into an ideal neutral state. Full on trail braking can also be used for various other reasons (Schumacher is a master of this, and so was Jim Clark).

Sorry, my wording was wrong. Before braking (i.e on straights) I see drivers giving the break pedal a little tap with their left foot (whilst their right foot on the throttle).

I think this question has already been answered so I shall retire.