If you want to do this yourself, start by taking off the tire and wheel and cleaning the brakes. Blow compressed air around the caliper. Use brake cleaner, but be careful not to get grease or oil on the braking surface and try not to soak the brake pad with solvent.
Otherwise, take it somewhere. Be able to demonstrate the problem - or get a much more detailed description.
Answers
Otherwise, take it somewhere. Be able to demonstrate the problem - or get a much more detailed description.