Cracked rotor
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
Honestly, the rotor looks way past its service life. That rotor was either cut or broken to cause the missing fin piece and it looks like it's under the minimum thickness so it's not a big surprise it cracked there. The rotor looking about evenly worn on both sides indicates the caliper is OK. Checking that the pads are about equally worn on both sides of the rotor would also tell you the caliper is OK.
Thread Starter
Advanced
Joined: Oct 2012
Posts: 86
Likes: 2
From: Lucas TX
Just ordered new rotors and pads for both sides. When I take off the calipers I will check the pad wear before I replace them - good idea.
I don't know whether it was the rotor or the differential or maybe even both making the noise. It prompted me to take it to tracdogg2 (Mike) to check out. At least I know the differential (and now the rotors) will be good when I am done.
I don't know whether it was the rotor or the differential or maybe even both making the noise. It prompted me to take it to tracdogg2 (Mike) to check out. At least I know the differential (and now the rotors) will be good when I am done.
Drifting
Joined: Jul 2002
Posts: 1,995
Likes: 110
From: Garland Texas
Mike
Le Mans Master
Joined: Oct 2010
Posts: 6,937
Likes: 848
From: melbourne florida
2023 C3 of the Year Finalist - Modified
about 25 years ago i came across the same thing. it was caused by a "mechanic" with a 10 pound hammer and not knowing the parking brake was set and the rotor was riveted on. 
6th Gear
Joined: Mar 2013
Posts: 6
Likes: 0
I think you must consult the company..They will better resolve the problem with original spear parts!
Angel Grinder
Angel Grinder
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Verdad Gallardo
Le Mans Master
Joined: Feb 2011
Posts: 5,943
Likes: 61
From: Southern NH
that's what the weight in mine is, metal tubing. i'll have to check the area on mine for cracks since the wheels are off right now
Racer
Joined: Sep 2009
Posts: 437
Likes: 3
From: Alvin Texas
Is it a color photo glitch? The crack looks "fresh", with no "rust tracks" from the area and no unusual wear marks in the area of the crack. There should be evidence of a slight uneven wear pattern at the site caused by the force causing the "bump" noise.
