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Hannes
I resurface rotors for a living. I do 5-6 cars a day, and this is a first for me. I resurfaced this VW Tiguan’s rotors about 1000km ago. Any idea what could cause this wear?
BlakeIs that in line with the cooling vanes inside?
BillYou made them too thin. Rotors have a wear limit and most of them aren’t thick enough to resurface.
JoshuaMost European cars you’re supposed to replace the rotors with the pads as well, me and one of my technicians was just talking about that cause the rotors wear down with the pads as well.
MattThey are Composite rotors. It can not be cut with a traditional lathe.
CaseyIn my experience, euro rotors are a softer material and are supposed to be replaced rather than machined. Don’t quote me. That’s just what I was taught. That rotor looks like it’s out of spec and getting very hot.
StevenIs it within spec? I’ve only ever heard of this from going too thin.
NicholasJudging by the picture the thickness is out of specs.
DaveBeyond minimum spec. If you’re machining rotors, you need to make sure they are within spec before you let the car go.
This is a HUGE reason why I always push to just replace rotors.
DonovanMechanic and machinist here. Looks like a couple things, I’d start with making sure the rotors are stable without vibration or chatter in your machine, as well as making sure your cutting bit, and its holder are in good condition.
Second, make sure you always use new pads after a resurfacing.
Third, if the customer drives the shit out of the car, within spec or not, they can trash the rotors. You said the marks don’t line up with the cooling veins, do they line up opposite them? Or are the veins curved?
How do the brakes feel during a test drive. Any vibration in the brake pedal? Is it possible the rotor was covered in a cutting coolant that you forgot to wash off?
For everyone saying you can’t resurface rotors, dealerships do it all the time. Yes, luxury European dealers do it. All the time. But they also get new pads.
ChuckLooks like hard braking before the pads set, it’s hot spotted around the fins in the cooling channels. Was the rotor at minimum tolerance after you turned it?
EssexThe only thing that is going to cause that is the cooling veins in the disc. Resurfacing discs is a false economy. Faster, easier and safer to just replace them.
WillHot cold spots where the veins are?
DonalBe careful as the thickness allowed is not a lpt for skimming. We used to do these a lotbut now the newer discs are a lot thinner, and you can’t reskim them afrer a couple of skims. For these rotors above you can see the cooling fins, and they are way too thin now and should be replaced
KevinCooling fins, the metal is too thin on the brake surface.
MikeSlow down your cut speed, put on fresh cutting bits, take smaller bites. If your in spec.I always left the lathe on and hit them with a DA also, with 80 grit sanding pad, to get that bidirectional finish, for breaking in the pads, and supposedly better stopping. Seems like it didn’t last long though, it just looked fancy.
MikeSlow down your cut speed, put on fresh cutting bits, take smaller bites. If your in spec.I always left the lathe on and hit them with a DA also, with 80 grit sanding pad, to get that bidirectional finish, for breaking in the pads, and supposedly better stopping. Seems like it didn’t last long though, it just looked fancy.
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