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Generally when brakes shudder in a Boxster...
... it's one of two issues:
a) The rotor has pad transfer. When on the track, if you come back from a session and come to a complete stop while leaving the brake pedal pressed, the extreme heat from the pad/rotors will bond the two together. When you start moving the bond breaks, but there's a thin layer of pad material on the rotor. Next time you brake, every time the pads roll over the embedded material the brakes grab a little more, giving the brakes a shudder.
b) If one or more of the front end's suspension ball joints is badly worn, the shudder will be very marked (almost violent on the track)
I have NEVER seen a Boxster rotor warp.
Rotor warp is thrown around as if it a common thing.
Maybe on a Civic, but not on a Porsche.
Happy Boxstering,
Pedro
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