As per RadioFlyer (love that nick) and JARblue, it's probably deposits on the rotors. It's possible that the problem is a worn part (bearing, bushing, rod end) but these will usually cause vibration at other times and are more often felt in the steering wheel.
Re-assess your braking techniques. Plenty of info/tips on this site and others. If the site's search doesn't work well for you, try any of the big web search engines and add "site:the370z.com" to your search string.
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