Its the pad deposits, I get them too. the session starts out smooth and deteriorates. after some easy street driving to and from the gas station, and cooling, they start out smooth again on the next session and get rougher. These cars just generate a ton of brake heat. I've had it with XP12, RP2, and Ferodo 2500 pads.
We really need cooling ducts.
Also, I recently switched to the carbotech RP2 endurance pads, and in three days at Road Atlanta, the rear pads are already halfway gone. Granted they have about a third of the surface area of the front brembo pads, which look like new, other than the paint burned off of them, but come on!
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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