They're caused by hot spots, but typically you get hot spots because you are
using to soft a pad that gets over heated or doesn't have the right heat
range. Here is a great reference on the subject:
http://www.stoptech.com/technical-support/technical-white-papers/-warped-brak
e-disc-and-other-myths
-greg
----------------------------------------------------------------------
Message: 1
Date: Mon, 2 Jun 2014 08:31:03 -0700
From: "Jonas Payne" <jpaynepbr@cox.net>
To: "'Martin Secrest'" <moira.secrest@verizon.net>,
<triumphs@autox.team.net>
Subject: Re: [TR] Slow Fast Slow Fast
Look for heat marks/discoloration on your rotors.
These "hot spots" are work hardened metal and can cause a pulsation.
If you have them, they can't be machined out. They can be caused by using a
pad that is too hard.
I run the softest pads I can find on all my cars.
Jonas Payne
PBR Consulting Services, LLC
702.882.6711
-----
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