I'm removing my factory installed 5mm wheel spacers on my 997.2 and from the manual (pix attached), it says I need to "fasten the brake disc with the short M6x12 countersunk screws, part # 900.269.047.09".

Do you guys know if I need to do this? I'm assuming if I used the M6x16 screws that were used to attach the spacers to the wheel hub, they would not work since they'd protrude and won't allow the wheels to seat flush.

Trying to figure out how necessary this step may be to ensure wheel installer does it, etc.

TIA

 

yes, you need them. the brake disc is technically locked in/held in place by the lugs when you have the wheel on but the screws are needed for: holding the disc on when the wheel is off as well as effortlessly keeping the disc lug holes aligned with the hub holes. i'm not sure if you can use your old screws. i think the holes are bottomless (so no protrusion on the disc side) but not sure if they would interfere with anything on the backside.

 

I've had those screws off many times when putting spacers on and off and as far as I can tell nothing is loose without them - I don't think they hold anything other than the 5mm spacer when installed. As I mentioned in my Rennlist response, just make sure you use the correct length lug bolt since I believe you said your new wheels will not require spacers - don't use the longer lug bolts you're currently using with the 5mm spacers since they will interfere with the parking brake on the rear

 

hmmm, i dont have spacers so maybe there's a second set of countersunks that fasten the spacer to the disc...? in any event, you should def use a set of screws to fasten discs to hub.

 

Thanks so much - let me call Porsche parts and order the shorter screws to use just to be safe

 

Thanks jhb, the standard length bolts were the one thing I got down- have them ordered along with the standard length wheel lock set and will be delivered today courtesy of Suncoast.

 

most of the bmws i have owned in the past had a single set screw. the audis i have had didn't have a set screw at all - it just made it tough to line up the rotor holes with the hub holes and the wheel holes, as the rotor could rotate. you just slipped the rotor around until it was in alignment and cinched 2 bolts down or you used the lug alignment tool that was supplied in some of the models tool kit. the lug bolts secure the rotor in place far more than the set screws. the set screws are a convenience, but do aid in proper alignment.

 

This, I had spacers with my previous wheels and my new aftermarket wheels don't need them. All you need is shorter bolts which I got from you.

 

I tossed the screws. The rotor is also held in place by the brake caliper and pads with the wheel off. If you ever strip out that screw head while trying to remove a rotor it will become obvious why you don' need/want it.

 

Thanks again Ynot, Alan, and everyone for the feedback