UFO conversion options

Bernie Benz b.m.benz at prodigy.net
Thu Sep 26 19:23:33 EDT 2002

> From: "Tom Mullane" <tmullane at snet.net>
> To elaborate:
> It is like the surface of the rotor that contacts the pad is too hard
> for rust to attack, so it attacks from the side, working its way behind
> the .25 MM shiny thickness that contacts the pads.  It starts at the
> inside and outside edges, then works toward the center of the ring.  As
> it moves in, the contact surface flakes off like thick paint, leaving a
> thinner and thinner strip in the center, like a road getting more and
> more narrow.  In the area that no longer makes contact with the pad, the
> rust is free to erode the rotor, unless the pads make contact with it
> again as they wear.  It this happens, it can be pulsation city.
"Pulsation city" only if the rusting action that you describe is not
symetrical around the circumference at any and all radii.  I see no reason
that it would not be so, unless is has been parked for a year in salt water
up to the hub caps.
> It doesn't take much erosion to reduce braking power drastically.
As I rationalized in my response to Çhris, I see no reason for this being
the case.  Resultant excessive pad wear, I'll buy.

> I have seen this mainly on rear discs that get light use.
> I don't know if this is any clearer...
> Tom

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