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With rotor so cheap, I recommend replacing them, rather than
grinding them. Grinding them costs what? $10? New ones cost
what $13? No contest.
WASH YOU NEW ROTOR! Mine came with all sorts of clean looking
grease on it. Use some dishwashing detergent, and make it bone
dry clean, with no residue whatsoever on it!!!
1. Break (loosen) the lugs on your wheel, and then jack the
car up, put your jack stands up, and then take off your wheel.
Put your wheel just in front of your rotor, so you will have
a place to put your caliper when you take it off. (Or you can
use a small garden stool, or SOMETHING just so your caliper
isn't dangling.
2. Using a 19MM socket, take off your caliper. It's the TWO
huge bolts, on the inner side of your car. The pictured image
below is of a front caliper. The read doesn't have that black
plastic thing.

3. Put the caliper on some sort of stool/wheel, whatever.

4. Pull off the Rotor, you may need a hammer, don't worry about
dining it, you're just going to throw it away! It should just
slide straight off.
You can see mine here, the brake pad wore away, and was grinding
away at the rotor causing a woosh-woosh-woosh-woosh-woosh sound
when I drove.
This is also a good time to replace
your brake pads.


This may be a time to adjust
or replace (at least inspect)
your parking brake. At least squirt some WD-40 on the adjustment
gear!
5. Now just put on your new rotor, it's keyed (idiot proof)
so you can't put it on wrong.
6. Then put back on your caliper, and you're done!

7. Okay, I guess you do need to put your wheel back on, put
the wheel bolts back on, and put down your car, then tighten
your bolts.
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