anyone seen this rotor issue before?

[DCNAZ73]

2003 bmw z4 2.5l, automatic, 112000, looks like aftermarket wheels but I can't tell. But wheels and tires are exactly same as what should have been on there from factory.
So for some reason there is a lot of noise coming from driver side. I thought suspension has major issues, when I jacked it up turned out the rotor retaining bolt in is half broken and fell off soon as I took off the wheel, When I was moving the tire from side to side the rotor was moving a lot more than it should, I thought it was the hub. But when I removed the wheel I saw the rotor lug holes look like this. Never seen that before, either someone found a rotor that looks like this or they drilled it to look like this when it is not necessary as whether the small area or larger area of the hole can accommodate the lug. Looked on other side on passenger and it's not like this, normal holes. So not sure why someone would do that. Wheels are aftermarket but same exact size as the oem that should be on the car. Once I held the rotor in place by hand and moved it since the bolt that holds it in is broken the noise is gone when I shake the rotor. But regardless whether the screw is there shouldn't the rotor stay in place and not move at all since the wheels are tight and flush? Just weird. Also the screw I found that holds the rotor is different than what should be, other side is oem, driver is a Philips screw

 

[BumpyZ4]

It looks like somebody got the wrong rotor and just made it "fit".

 

[DCNAZ73]

I wouldn't be surprised, I ordered another and a retaining bolt, that broken one wouldn't drill out, ill do without it, done so in many vehicles, just a bit of a pain putting the wheel back. Also, the spacer maybe worn, there is sp much play with the wheel on bolted. I looked at the other side and its same exact look of spacer bit no play, and rotor holes are correct not like this one. Not sure with someone did.

 

[paul__mck]

If the disc wasn’t sandwiched properly some back to front movement when braking would have maybe ovalled the holes. You’d think you’d notice though would make some racket.

 

[axelleveau]

Looks very much like the wheel was loose and disc started slipping back and forth after the retaining screw sheared due to taking the stress from braking... The bit I don't understand is how it went that bad without the wheel being noticed first :|

 

[j3nks79]

Looks very much like the wheel was loose and disc started slipping back and forth after the retaining screw sheared due to taking the stress from braking... The bit I don't understand is how it went that bad without the wheel being noticed first :|

I’d agree with this.
Either way you need to replace the discs and pads asap

 

[DCNAZ73]

Thank you all. Ya agree it could be anything. I have had so many bmws and worked on all, never seen this before. What kills me is that the widening of the holes is pretty much exact on all holes. Why would anyone drill it i dont know but i doubt. But like you mentioned if the wheel was loose no wat for all of this to happen and they didnt notice. Also no rubbing or marks on inside or outside of wheel. I have not yet driven it lol. Waiting on a rotor. The soacer looks fine, maybe a bit worn but same as other side and other side is tigjt.

 

[paul__mck]

Spacer would be my bet if it was binding up on the lip of the hub and not getting a good seal to the disc face.

 

[DCNAZ73]

Usually, whenever I install or see a spacer it would be on the outside, but these when you install go underneath the rounded area the rotor when installed. Problem is it will be difficult knowing what size to order it

 

[j3nks79]

Thank you all. Ya agree it could be anything. I have had so many bmws and worked on all, never seen this before. What kills me is that the widening of the holes is pretty much exact on all holes. Why would anyone drill it i dont know but i doubt. But like you mentioned if the wheel was loose no wat for all of this to happen and they didnt notice. Also no rubbing or marks on inside or outside of wheel. I have not yet driven it lol. Waiting on a rotor. The soacer looks fine, maybe a bit worn but same as other side and other side is tigjt.

Replace in pairs

 

[DCNAZ73]

Rotor? Ya will do once i confirm its the rotor. Thanks

 

[thespannerman]

If you put a spacer behind the disc (rotor) and the hub it will place the rotor in the wrong place compared to the caliper and pads, so just about everything seems wrong with the way that one has been installed. Go back to Oem spec, no spacers behind the rotor, and bin that rotor and spacer, and replace both sides together with new pads

Al

 

[DCNAZ73]

The spacer is not behind the rotor, it goes up front on the hub and slides half way under the round part of the rotor center. Without the spacer there is a lot of plau

 

[DCNAZ73]

Also here are the numbers from back of wheel

 

[j3nks79]

How big is the centre bore in mm?

 

[j3nks79]

The spacer is not behind the rotor, it goes up front on the hub and slides half way under the round part of the rotor center. Without the spacer there is a lot of plau

I think you are talking about a spigot ring as the centre bore in the wheels looks bigger that 72.6mm

 

[axelleveau]

Honestly, if the discs are not out of round and the pads are not trashed I would not even replace them. I know those are safety items and don't cost much but I don't think anything is wrong with them and the wear on the holes is fine as in theory no efforts go there.

Just stick a new disc retaining screw which will align the disc holes and wheel bolts and ensure when you tighten the wheel that it sits on the face of the discs ensuring the disc is firmly pinched and that it does not bind on the spigot as some fear

 

[DCNAZ73]

ya I think its a spigot ring, bit am not sure what the full size should be before it got worn out, both sides look the same as far its placement in center nd then partially under the rotor. Other wheels don't move....retaining bolt was broken inside and am not able to get it out with a drill or anything else. I ordered a rotor and a bolt but I have someone coming to look at the spacers he knows more about wheels than I do. Worst case I'll use a spacer from the other side and see if that fixes it first. I will keep on working on the retaining bolt. I have to put a new rotor even if that doesn't affect it, the way it looks makes me suspicious of why it happened.

 

[DCNAZ73]

Rack has ton of play on passenger side am gonna replace it first as i think a lot of it is coming from ther

 

[axelleveau]

I believe the 79mm bore on the discs is correct as it sits on a shoulder which is bigger than the bore for the wheel. What is for sure wrong here is that spigot adapter having an OD of 79mm, excepted if your wheel had such bore but I very doubt it, most 5x120 wheels come with a 72.6 or 74.1mm bore.

I would advise you check what bore your wheels have, if they are 72.6 then just put them on without the spacer, if they are 74.1 then buy a set of aluminum spigot adapters from 72.6 to 74.1, available on Amazon and lots of other websites