Anyone had a problem with your front calipers making a clicking noise when you step on the brakes???it sounds as if a pistons in the caliper is stuck and when it clicks it seems to break free,from time to time a get a shimmy when i come to a stop like my rotors are bad then other times it stops with no shimmy at all my 4runner is a 2004 bought by me brand new and has 42k with the factory brakes on it all the way around...could the calipers be bad or something else,please help for i am taking it into the dealer monday and would like to have a good ideal what i am talking about,also i do have the 100k protection...thxs