Marexus

iTrader: (1)

My problem was more then likely mismatched pads to rotors causing an uneven braking surface.

or

Getting warped in shipping, which is something that used to happen when I was younger working at autozone.

The guy that worked on it told me 5/10 new rotors he gets have to be resurfaced...

Kurtz

iTrader: (1)

Well, keep in mind that's the ideal method to bed pads in, and get it done in under an hour.

Simply driving gently on them for 300-500 miles will ALSO bed the pads especially on new rotors... but:

1) It takes way longer

2) That whole time you risk screwing the process up if you have to do something like make a really hard stop and sit on the hot brakes while stopped or something

3) If you need to "clean up" any unevenness or different compound from previous pads this isn't the ideal method

Hence why it's better to insure it's properly done, and quickly, if possible.



then that guy is an idiot.

If you receive new rotors that are defective, return them for non defective rotors- don't shave useful life off your BRAND NEW product then sell it to a customer as "new"

Or just stop buying from such a crappy supplier.

And if you can explain how a solid piece of iron can "warp in shipping" I'd love to hear that. It was defective when made if it's got excessive run-out when new.

Here's OE Quality Frictions FAQ on this:

(added)

Don't use badly manufactured parts.


Again, read that GM thing I posted, they mention more than once you should not resurface brand new rotors. If they're out of spec when they arrive, send them back and get non-defective parts.

then later on-
As to the pad issue-I'm glad your issue is solved, but if that was the case then a good re-bed would likely have fixed it for free, without, again, shaving useful life off the rotor.

Like I said, cases where you should machine a rotor are relatively few. In most cases it's unnecessary and just leads to needing new rotors sooner.