blackc6z

Can the stock rotors be turned atleast one time on my 2007 Z06? i have 25000 miles on my car and it has never been tracked and my rotors only have a light glaze. I'm doing a brake job and thinking about turning them. I had a 2005 Z51 with drilled rotors that i had turned and never had a problem. just asking..........

JwT

Sure why not. I would just inspect them after their turned for cracks or anything that doesn't look right.

RichieRichZ06

Yes, you can usually turn them one time. We have a lot of customers that will replace them every brake job because a new one is only ~$80 forum cost and turning them is usually around $40.

8850

The number of times you can turn the rotors depends on how much is taken off each time. For example the front are 1.260 thick new. Recommended 1.205 minimum with 1.190 throw away. If you can clean them up with .027 (.0135/side) then you can turn them twice.

jvp

I know you said you don't track your car, but the rule still applies:

NEVER TURN ROTORS!

One of the secondary jobs of the rotor is to draw heat away from the pads and vent it off into the inside of the spinning wheel. Removing any material from it will reduce its thermal capacity, making it harder for the rotor to do that.

Never turn your rotors. If you have a glaze on them, then go out and heat them up by doing a series of slow-downs and stops, and then cool them off with a short drive. Better yet: just replace them.

Never turn rotors! Get the hint?

2019 ZR1

I agree with not turning rotors...

glenB

Oh please ..........

3LZZ06

For $80 bucks a piece for brand new, what's the point?....

8850

$87.10 to be exact at GM parts house x 2 = $174.20 plus shipping vs. $30 bucks or about $15 each to turn. Good enough reason to me. And I've had plenty of rotors turned in my time. However, I never have road raced with turned rotors. Turned rotors work fine for me in drag strip use.

Bill Dearborn

Don't turn them and don't replace them. If they are in good shape they don't need to be turned. If you are changing brake pad compound the new compound will build up its own transfer layer in a few day of stops. If you want to speed that up use some sand paper to scuff the rotor surface.

Bill

erikszr1

cut these and there wont be much left. either buy new or leave em alone.

jvp

Any sage automotive brake engineering experience to share with us regarding this topic? Perhaps with some physics background? Or are you just being argumentative based on "experience"?

RFZ

i turn them all the time. would never do a pad replacement without turning them myself.

glenB

I'm saying this based on the millions of cars on the road today that have had their rotors machined without any adverse effects.

The guy drives it on the street, if he tracked it then I would agree with not turning them, but for the street there is no harm.

Otherwise, submit your proof that he needs to replace them only. The street is not the track.

And turning all 4 is only about $60 as opposed to $320 for all new.

jvp

It's frightening how much ignorance there is displayed in this thread regarding a key safety component of the vehicle.

To the OP: I'd highly recommend not skimping by trying to save a little money and getting your rotors turned. I wouldn't do that. Follow Bill's advice if you're concerned about glaze on them, or just change the pads and let the new ones scrape the old crud off.

But: it's your choice.

glenB

I guess it's ignorance when people don't see things a one way, a lesson learned from the demo playbook no doubt

Still waiting on data that shows turning rotors on a street driven vehicle severely impacts their performance

Bill Dearborn

Will not impact them. However, as you mentioned in a previous post it costs $60 to turn them. Why spend the $60 if there is no need to do it. Even the GM Service Manual recommends not turning the rotors unless they are scored. OP indicated there was no real issue with the rotors so I say he shouldn't bother turning them and avoid dumping $60 into something that isn't necessary.

Bill

glenB

Not saying he has to, only that he can without severely impacting their performance.

RFZ

after more brake jobs over the past 40 years than i could possibly count, i can state without a doubt that not turning rotors during a brake reline is a bad move. i have never seen a rotor that has worn perfectly evenly. if the rotor is not badly worn a light cut trues them without taking of enough metal to effect brake cooling. anyway min thickness is on all rotors and as long as not cut less than min there is no problem. miss info on this forum is the norm. ask any mechanic who does this for a living and you will know.

its just like all the valve threads. people who are not working in the field or who have been for a few years are expert. so much miss info / sky is falling and people who come on here to learn get all sorts of miss info. just like anything else on the internet. 95% is bs.

my good judgement comes experience, my experience comes from bad judgement. over 40 years worth of doing it for a living gets one lots of experience.

my .02 and thats all its worth!

erikszr1

i like it especially the part about 95% BS