Yep, mine had it too. Resurfacing the rotors worked for awhile. But I wasnt going to do it again. I would like my rotors to last awhile. So i jack up the car. All fours off the ground. Pull tires. Pull calipers and wire them out of the way. Just take out the two mounting bolts. Simple. Look inside the calipers, you will see the brake pad surface. Take a 60 grit rigid sanding disc and scuff all the glase off. Both sides. Now have your buddy start up the car and put it in first. Get the rotors spinning. You will need a Makita 4" grinder or equilevent. Makita makes a sanding disc that look like it has a bunch of little flaps of sand paper layed down on each other. This worked perfect. While the rotors are spinning, hold the sanding disc on the rotor (90' to the grooves on the rotor) and move EVENLY from left to right. Keep repeating until most all the shinny is gone. Check out the picture. This took off very little metal. Mainly roughed up the surface. Put it all back together and break em in like they were new. Ime sure it will happen again, but ill keep doing this little 2 hour fix until i find a better one.....RRR

 

How does the ACD system react to having all 4 wheels off the ground and rotating in gear? does it put a stress on the pumps?

 

Wow, great post. I'm actually getting my rotors resurfaced late next week. This will be some good info to have on hand when I bring it in. Thanks.

-Robert

 

I dont have ACD. Dont know how any stress could build up with the tires off the ground. Only issue to figure out was how to get each of the fronts to spin since its not LSD. Well, i mounted a tire on the opposide side i was working on. The weight caused the other side to spin. Then change sides take off the tire and mount the other side. Then that side will spin. Seems like the side with the lease resistance would spin.....

 

This is what mechanics do after they turn the brakes. At least they should. The ones I know do.

 

oOo... tricky tricky

 

Did your rear rotors get messed up or just the fronts? My fronts were the only ones that got screwed up on mine. It happened at 7k, 11k, 14k, turned rotors each time with new pads. I finally got new slotted front rotors at 15k and everything has been fine since, almost 40k on the car now.

 

you know, it could have been just the fronts. Dont know. I really dont think its a warping issue though. My dial indicator only moved 3 thousandths. There is no way thats enough to vibrate the wheel out of my hand.

 

.003 no it isn't a lot, but at higher speeds everything is intensified.

 

Just to give a relative idea of how small .003" is, a sheet of paper is typically .004" thick.

 

its pad material transfer or imprinting - good pads always crap on the rotors but you can re-bed it off usually

 

Yes thank you, I am quite aware with how small .003 is considering I deal with circuit connectors that have less then .0010" tolerance allowed on them.