I got a civic 06 auto but these few days i noticed that the left rear wheel has some unusuall noise....kinda like those train....when they move along the tracks....the metal hitting against metal noise.....but it doesnt always occur...it just occurs sometimes and then its normal...then it comes again....
anyone got any idea what is happening?

My civic has done about 13000kms and just did my 10k service 1 mth ago