EBC Rotors and tolerances

Steven Bixby steven at bixbys.net
Wed Mar 12 17:27:04 PDT 2008

She only rode about 50 miles, mostly freeway, so I kinda doubt there's
much build-up, but I wouldn't know - this concept is new to me.

I think I'm going to pull the rotor off again and take it to the shop
(a Cycle Gear, at which my wife-the-MSF-ridercoach gets a 30%
discount) and see if they'll get us a new one.  And if so, then this
time I won't touch it with the sander.  I don't have (access to) any
truly flat materials as you describe, so I hope the raw rotor and
essentially-new pads won't be a problem.

(Presumably bikes fresh from the factory won't have had the rotors &
pads "properly prepped" as you do?)

On 3/12/08, Steve Northrop <blackgpz at rochester.rr.com> wrote:
> The sharp edged holes are not a factor. The pulsing is typically caused by
> an uneven deposit of the brake pad material on the rotor. This may even be
> the variance you are measuring. I probably wouldn't have used an orbital
> sander on something I wanted to be really flat. I prep my rotors with 180
> grit emery cloth over a piece of ground A2 stock. I also de-glaze the new
> (or old) pad surfaces as well. Remember to degrease everything too. This
> assures full, clean contact when bedding in the brakes. You'll have to sand
> the rotor again to remove the pad deposits and start over. It won't just go
> away. Good luck.

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