I am about to swap out my front brake disc:

Rotor coming off: 3.2mm, very grovy (i.e., deep groves, not groovy, OK, maybe you can consider it groovy   )

Rotor going on: Kerry's old rotor (mucho gracias!), 4.1+ mm, nice and flat.

Question: I am going to reuse my pads--do I have to sand them?  Can I sand them?  They are almost new, less than 100 miles.  EBC organic.

Input appreciated!

Cheers,
e.

My general rule is not to f%$k with anything brake-related. If you have a method to sand the bads down nice and parallel, that might be an option.

I'd just replace them, they are not that expensive after all.

If I had to use them I'd probably just br(e)ak(e) them in.

Unless your pads are really grooved from the rotors, leave them alone. In less than 100 miles I doubt that there is anything wrong with them.

As for the rotor, take a scotch bright pad (a fine grit wet sand paper works too) and clean them with it. Run water over it while cleaning. This will remove any of the old pad material and allow for the pads to seat properly.

Cool.  Thanks guys.  I'll leave them pads alone then.

Cheers,
e.

If the pad surface looks ok, they slap them on.  If they have glazed over a bit (glossy, shiny) scuff them with some sand paper and they should be fine.  Never had to use water to wash the friction material before.  That should not be necessary, just wipe/lightly slap them to get the excess dust off.  The first time you hit the brakes should take care of anything left on the pads.

*Also don't forget to pump up your brakes after assembly so you have brakes when you take the test ride*