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On 1 Dec 97, Steve Bradley wrote:
> This note on squeeling disc brakes. A local auto repair radio talk show in
> Atlanta has a mechanic named Sam Memmolo on it. He says the reason disc brakes
> squeek is that the rotors have probably been turned using a directional cutting
> tool (the kind on just about every brake lathe in mechanic shops).
>
> These directional cutting marks cause the pad to "dance" on the surface of the
> rotor when pressure is applied, thus causing them to vibrate against the pad
> holders and make a noise. The cutting marks can also cause new pads to
> prematurely fail, depending on the type of pads used.
>
> He says the original cut on the OEM rotors is done using a helical cutting tool (
> makes curved cutting marks across the face of the rotor instead of parallel to
> the direction of rotation of the wheel).
Lots of BS. There's plenty of examples of well-used (polished)
rotors that still squeal. The swirl pattern on new rotors is done by
grinding, not by any such thing as "a helical cutting tool." He
should know better. If those were his words, don't bother listening
to him unless he is entertaining. He is not enlightening.
Jim
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Melissa Kepner Jim Adney
Laura Kepner-Adney
jadney@vwtype3.org
Madison, Wisconsin
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