Without knowing the circuit, you might be suffering a bit of brake knock off too?.?.?
You can try tapping up the pedal just before hitting the brakes to see if that helps. I'll also add my voice to a bit of air being in the lines too. Straight after a session on the track, doing a quick brake bleed would let you know for sure.
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Current: 135i Auto, Le Mans Blue - w/ Bridgestone RE-11 rears, GP Thunder 7500k angels, & "golf tee" mod plus a few M3 suspension bits and pieces...
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