“Warped”:By far the most overused term in disc brakes. Having a “warped” rotor means that the metal has been physically distorted. This rarely ever happens on passenger vehicles. Typically, the vibration you are feeling is doe to “hot-spotting.” This is when a section of the rotor becomes so hot that debris from the brake pads melt to the rotor creating a high spot, which impacts run-out.
If your rotors do not demonstrate any of the problems listed above, there is absolutely no reason for your rotors to undergo an extensive resurfacing. Typically, a once over with a circular, abrasive pad—known as a cookie—on a high-speed angle grinder will create a good surface for the pads to grip. This also prevents your rotors from having a layer removed from them, bringing them that much closer to their discard spec.
Another key with brake pad service is that noise sometimes happens. A faint squeaking or squealing does not mean there is a problem. Check the pads when you hear this noise, but if they are in good shape, all if fine. Never attempt to fix a squealing sound by having the rotors machined, this will not help.
^ thank you, you cant warp a rotor, you just leave pieces of the pad behind on the rotor.
Correct me if I’m wrong but when metal get’s extremely hot it can deform, no?
I’ve heard that not torquing your wheels properly (uneven) can “warp” rotors.
Google warrior to the rescue!
I bought rotors + pads for my Jetta from Autozone (never again) and when braking hard on the highway they still shimmied a bit. Drove me nuts.
Nobody believes regular postings might as well have some backing into the post.
Nothing I haven’t seen in the years of selling all sorts of rotors, seeing all sorts of installs and customers coming in with idiotic problems.
This is the same message you will hear from the companies if you call them about it.
wouldnt hitting them with a pad on a grinder make them worse due to not covering the entire surface area evenly? It would seem really easy to make high and low spots that way.
Isnt that why its not recommended to hit a gasketed surface with one of those to clean the old gasket off?
Rotors do warp , despite what people say . Come to my work and ill throw one on the lathe , ya ain’t pulling .05 off a Rotors that’s magnetic pad material lol
agreed.
You’d have to get both sides of a vented rotor glowing hot and whack it with a sledge to get it to actually warp…maybe. You can put a rotor with pad deposits on a lathe and take a measurable amount of material off of the high spots, doesn’t mean the rotor’s warped, it just has high spots from pad deposits. Nothing to do with magnetism, either, lol.
We’re all arguing the same thing with different words.
Older, solid style, non-vented rotors might warp with some crazy heating and cooling. Like hot brakes+puddle…maybe, but certainly not a cast, vented rotor.
No lol , to tight a lug nut ,hanging caliper will warp a Rotors I’m not saying pads don’t leqve deposits but when ya hit the pedal and shit shakes ya it warped assholes lol
I run hawk 9012 blues on the street for this reason. Traditional street pads are such junk they just glue themselves into the rotors and shake, obviously some are better than others.
There is no brake pad that will “mill down” a rotor! If the rotor is warped it will hit the pads and create friction on the high spots causing them to heat the rotor unevenly and inducing more warping and fading. The brake pedal may also have more than usual travel all tho it would be hard to notice. The rotor will spread the pads wider than normal and it will take more fluid volume to make up the distance for effective braking pressure.
Dont rule out the tires. I have seen plenty new tires even good brands like michilin, dunlop, and BFG came from the factory out of round, broken cords, shifted belts, ect. You had the 's problem before tires so It’s probably your rotors or possibly even a bad wheel balance. Make sure none of the wheels have a large amount of runout either. If you can see it on the balancer it is probably excessive. I doubt you would feel any of these thru the brake pedal anyway.
This guy seems to know a thing or two (if link works)
Worth a read.
Everybody’s a tech in here :lol can we throw drums being “out of round” in here too?
anyone who says rotors don’t warp OR delaminate needs to work on more GM vehicles. /thread
I finally agree with you on something. :lol
I’m pretty sure that you just agreed that GM = Garbage. 
<3
And, it doesn’t take rocket appliances to realize that Paul’s 2006 pickup truck is constantly falling apart.
LOL. Rocket Appliance!
I am a tech bitch. ASE Cert and all.