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Old 11-12-2013, 01:55 AM   #1
Crazy Dazz
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Default "lipping" on brake rotors?

I’ve had a car failed because there are “lips” on the front rotors. Ie the outermost 2mm on the rotors isn’t machine or swept by the pads, and sits proud of the machined surface.
Not only does this make zero difference to the operation of the brakes, but I suspect this is actually the way these rotors were made???
The car has done under 80kk, the rotors look to be in perfect nic, and I have run the calipers over them and they are well within spec.

I imagine I could get them skimmed, but not sure if I could be bothered. If they need to come off, I’d probably just buy new ones, but I resent spending money that I don’t have to.

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Old 11-12-2013, 03:00 AM   #2
fte50
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Default Re: "lipping" on brake rotors?

The lip is actually the pads non contact point, therefore meaning your actual braking contact surface has worn 2mm. Lips generally don't appeal on RWC and a minimal skim is usually required providing you meet min. thickness, but again it all depends how stringent/fussy the issuer is.
They owe you nothing, bugger all to gain except a possible repair labour fee, with lots to lose.
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Old 11-12-2013, 10:42 AM   #3
Peter B - CV8
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Default Re: "lipping" on brake rotors?

Emery paper & a bit of elbow grease. Problem solved !! (unless the rotor is below min thickness..)
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Old 11-12-2013, 10:49 AM   #4
ratter
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Valued Contributor: For members whose non technical contributions are worthy of recognition. - Issue reason: Shares his in-depth tuning knowledge with the forum, very helpful. Contributor: For members who make a contribution worthy of recognition. - Issue reason: For his indepth tutorial on adding borders to photographs 
Default Re: "lipping" on brake rotors?

rotors are not supplied with lips, as mentioned they have worn into the rotor and if they are 2 mm the rotor may actually be getting close to minimum thickness
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