How to I make my rim brakes stop making loud ugly noises ? I just bought a new bike today, and I took it out for a test ride and the brakes just make a super ugly and loud noise when I use them, my brother says I just have to break them in , but some of my friends say I have to get new brakes ? Anyone help
After greasing my chain, some grease got on the rim of my tire.  It made a terrible noise while braking.

Sand grains that has gotten stuck in the brake pad can also cause screeching noises.

I recommend try to make sure there is no debris around the brakes.  Also make sure the rim is very clean.  Scrub it down to remove all oils, greases and debris.