[Jurven240z]

Have 1600 miles on my rotors in a 10 month period. Lately my rear has started making noise on the initial engagement then it goes away but comes back. Pads were replace in Dec and have good meat left. Did a light sanding of the rotor and pads but it still came back. Did a pad swap with the front and sure enough the rear started making noise after 20 miles. Rotor is straight. LBS mechanic told me its time to replace the rotors. Any advice on what the check.

 

[Cleared2land]

Personally, I think your LBS mechanic is trying to sell you new rotors. I have more than 5,500 abusive miles on mine and there's no way yours need replacement at 1,600. There's tons of threads here on noisy brakes. Check them out and tell him to go out for more coffee.

 

[11053]

I wore out a rear IceTech rotor in less than a year.
There was a noticeable and visible difference in rotor thickness between that rotor and a brand new one.
I forget the measurement difference, but it was substantial.
I have another set of Icetechs with more time and mileage on them, and they look very new.
Mileage and time alone aren't good ways to to define rotor service life, there are tons of variables.

Have you tried swapping rotors front to back?
If your rear and front are the same size, do the swap and see if the problem develops.
If your rear and front aren't the same, try removing the rear, rotating, and mounting it back in a different position.

Finally, it's a $40-50 part +/-. Don't get too hung up on it. Do the swap I suggested. If that doesn't fix it, just replace it if you think it's worn out.