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Join Date: Aug 2011
Location: Bend, OR
Posts: 80
Help identifying brake rotor part

While attempting to diagnose a growling noise from the right front of my 1980 911SC, finding a stuck caliper, I also found what appears to be some type of retainer in the brake rotor. Please see pic. In my haste and unawareness, I attempted to remove it, thinking it was a brake pad retainer pin clip. Needless to say it took quite a bit of effort to destroy while removing and I'm left with an uneasy felling as the same part is present on the driver side front rotor. What in the world did I break?

Old 04-23-2022, 05:59 PM
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Join Date: Oct 2012
Location: Miami, FL
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Doesn't make sense that anything would be stuck into vent slots. Is far fetched to be for balancing but still, I looked into this...



Cutting notches into rotor makes sense for balancing. I'd conclude those things are not for balance----but not saying I'm right.

Does other side look exactly the same---1 vent slot between them and positioned the same way?
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Current: '80 Silver Targa w /'85 3.2. 964 cams, SSI, Dansk 2 in 1 out muf, custom fuel feed with spin on filter
Prior: '77 Copper 924. '73 Black 914. '74 White Carrera. '79 Silver, Black, Anthracite 930s.
Old 04-23-2022, 11:50 PM
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Balancing weight.
Old 04-24-2022, 01:58 AM
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My understanding is balancing weight, as well, from some of the info I was able to find last night. Since I was foolish enough to rip it out of one rotor, it’s probably a good idea to replace the rotors.
Old 04-24-2022, 07:06 AM
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You’re going to need to have those balanced or replaced.
Old 04-24-2022, 07:08 AM
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I’m going with replacements. Ordered a pair of Zimmerman rotors from our host. I’m also going to rebuild the calipers and repack the bearings while I’ve got the brakes disassembled.

Old 04-24-2022, 09:22 AM
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