Braking noise

Check the toe-in on your break pads. Tighten the bolts on your brakes.

and/or

Give your rims a good wipe down with vodka.

or

Go brakeless.

this is the answer. and you don't need a caliper to do it.

the front end (like the end farther towards the front of the bike) of your pads should be about 1-2mm closer to the rim than the back of the pads. If your pads don't have kind of bushings which to allow angular adjustment, then just take off the pads, sit a crescent wrench on the arms of the caliper and bend then slightly to achieve the same effect. the purpose of this is to prevent the squealing noise.

edit:
here's a link. didn't read it, so it might suck.
http://www.jimlangley.net/wrench/brake1.htm