Fbody1

it is time for a brake job, I have kvr cross drilled rotors , all rotors have a slight groove in them and a glaze on them, they do not shake or anything like thatwhen stoping, I was thinking of using some sandpaper to scuff them up before installing the new pads, is sandpaper ok to use or should I use something else?

Severous01

pring them to ... anywhere, say pep boys. have them put the rotors on the turner and use a disc grinder at a slow speed to take a few layers off. this way you get a new cross-cut in the process. i'd suggest not using the disc on the rotor unless you have it spinning at a constant speed...

Fbody1

so the disc grinder , is that somthing common ,will they know what I am talking about, is it a stone or somthing ( some of the places around here have morons working for them) thanks

nin97

they'll know what you're talking about...its common

ExStyle

Pretty much any automotive shop will be able to do it in house or be able to send you somewhere. Ask to have your rotors turned

Severous01

if you dont want the grinder on it, tell them to use the steel wool pad, or use the wire brush thingy...but they'll know. its well known to do this to put the cross-hatch pattern (similar to new rotors) back onto freshly cut rotors. if you dont need them cut, but "resurvaced", you can just take the first layer or so off.

Red96Lt1

This is different than turning. Turning uses a tool that goes around the entire surface of the rotor and will get messed up when it hits one of the cross drilled holes. A grinder uses a stone to resurface. Wouldn't have thought about using it on rotors, but it will work and leave a better surface than turning. I would check prices because grinding will cost alot and it may be cheaper to buy new ones.

On the other hand if it were me I would probably to the sandpaper option and hope for the best. If you screw up you can always grind them (assuming you didn't screw up too bad).

ExStyle

No the holes will not hurt the machine or the tool in the machine, however considering they are grooved I was thinking they would most likely need turning to even out but if its shallow they would most likely resurface and put the cross hatch back on.

Z28barnett

GM does not recomend turning the rotors for a pad replacement. You need scoring greater than 1/16" before even thinking about it.

If your rotors have a mirror polish from use, that is a good thing.

If you have ever had rotors turned, you would find out they are terrible until they polish smooth again. I mean terrible, it is like they have been greased.

Turning will just shorten the lifr of the rotor.

I don't think rotors can even glaze, perhaps lousy quality pads could.

Z28

Red96Lt1

I have. Try doing a 130-60 mph brake test. had small cracks all over the rotor and glazed them. They were a year old autozone replacements. Maybe that was why?