I have a 2003 Civic Sedan, auto with about 48Ks...and im due for a brake job at my next service (soon). What's the deal with replacing/servicing the Discs in the front and Drum in the back?? Should your replace/Service them or just get them machined? Is there a need to do anything to them at all? Also, what's the avg life of a set of pads/Drums/Shoes ie: how long "should they last" assuming "normal" driving? Thanks ! AH