I would not want the brake touching my frame anywhere but at the bolted pressure points. This holds true under hard braking conditions as well. My opinion is that there needs to be washers or the spacer between the brake and the frame in your case. Maybe get some fender washers, since they have a larger OD and give you the widest support base for the brake.
On Tue, Jun 1, 2010 at 2:30 PM, donald gillies <gillies@ece.ubc.ca> wrote:
> One of the great things about traditional centerpulls and sidepulls is
> that the central pivot bolt allows the brakes to track a bent rear rim.
> If the centerpull arch is touching the frame, however, when your rear
> rim gets bent, you will likely scrape off a great deal of paint or
> otherwise bash the seatstays as the brake tracks the bent rear rim.
>
> Here's an ebay photo of a weinmann brakeset with a circular aluminum
> spacer on the back brake.
>
>
> http://i.ebayimg.com/
>
> Here's an example of an M6 spacer for brakes :
>
> http://www.biketoolsetc.com/
>
> - Don Gillies
> San Diego, CA, USA
> _______________________________________________
>
--
Ken Freeman
Ann Arbor, MI USA