[JusticePete]

Originally Posted by SSE 4 2SS

I'm glad he steered you in the right direction.
Turning them is something a brake or machine shop does on a special lathe...

They chuck the rotor up, and cut both side at the same time. You may see them wrap a big weighted band around the rotor, that is a harmonics dampener, to reduce harmonic chattering when they are cutting them... It allows for a smoother finish. This will true, or straighten up the rotor if it is warped due to heat or excessive wear say for example if the brake pads wear down and allow the rivets to get into the rotor surface....

It's not a big deal, but I agree, the front rotors should be replaced if you are into heavy driving, hard on the brakes as in performance driving, if you casually drive it to work and never really hammer on the gas and brakes, and the rotors are still fairly true, then turning should be ok, but... I would never ever turn the front rotors more than one time...By this I mean, if you turn them now and put them back on, a year or two or three from now or whenever they give you problems again, do not turn them, replace them... It will take probably several passes with the brake lathe to true up both sides...They are only cutting thousandths of an inch off at a time... and a reputable brake shop will havee the numbers available for the minimum tolerances. It's usually imprinted on the rotor...This is the thinnest the rotor can be and still be useable...

Thats just me though... Front brakes are roughly 80% of your braking power....

Sorry if I went too far in this explanation, just wanted to make sure you understand the terms and have some information...

Spot on!