Every time you start the car, you step on the pedal. Many people take their
foot off, then put it back on to go into gear....MINIMUM, the pads got cycled
without the pads sliding on the rotor, NO wear to the pad. Ever take your foot
off, then get back on before hitting 1 mph? Pad gripping is one movement,
releasing is another.

How much of a size difference between a new and a non-turnable rotor?

--- In toyota-prius@yahoogroups.com, Levi Smith <LeviGSmith@...> wrote:
>
> I'm surprised you're having to replace discs. I would think the calipers
> would be the part needing to be replaced...
> The disc itself has no moving parts... Any normal amount of rust on the
> disc shouldn't be a problem and most should get wiped away on the face in
> short order of normal driving.
>
> The calipers however get rust and/or corrosion and start to
> stick and wear out the pads unevenly...
>
>
> The only reason I could see the discs needing to be replaced because of
> corrosion would be if
> they were SO corroded that they were near falling apart...
>
> Can you shed any more light on this?