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Old 11-08-2011, 03:37 PM   #4
thstone
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
A purist (like the Porsche technician) will always want to start with a perfectly good rotor surface so the new pads can bed in without any risk of problems. This ensures good braking performance and reduces the likelihood of the customer bringing the car back with a problem (one of the tech's biggest concerns).

A pragmatist will say that a 0.5mm lip is almost non-existant in the first place and is not likely to have any affect on braking performance and should be a fine starting place for bedding new pads. And the likelihood of actually having a problem is pretty low and even if you do, you can easily fix it.

Either apporach is generally acceptable and the answer you get generally depends on who you ask.
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