 Rear brake disk retaining screws for drilled 5 lug hubs |
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| tornik550 |
 Jul 26 2016, 05:10 PM
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#1
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Senior Member  Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None  |
On the rear of my 914, I have 4 lug hubs drilled to 5 lugs. I have sebro rear disks.
I was going to install them however when the hubs were drilled, now the M6 disk retaining screws do not line up. Are these necessary? Should I just drill and tap the holes for the retaining screws? |
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| 914Sixer |
Jul 26 2016, 05:17 PM
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#2
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914 Guru Group: Members Posts: 9,040 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region 
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I guess I am confused, did you drill the rotors too?
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| tornik550 |
Jul 26 2016, 05:30 PM
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#3
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Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
Sorry for my poor explanation. I have 914/4 hubs that were drilled for 5 lugs. Now that they are converted to 5 lug hubs- the brake disk retaining screw holes on the brake disk do not align with the tapped holes on the hub.
In the first picture- the A-holes do not line up with the b-holes in picture 2. The question is- is there an alternative or do I simply have to drill and tap new holes in the hub? Attached thumbnail(s) 
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| tornik550 |
Jul 26 2016, 05:31 PM
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#4
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Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
Attached thumbnail(s) 
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| wndsnd |
Jul 26 2016, 05:32 PM
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#5
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You wanted a horse, but got a goat. Nobody wants a goat.... Group: Members Posts: 2,861 Joined: 12-February 12 From: North Shore, MA Member No.: 14,124 Region Association: North East States  |
Why cant you just rotate it?
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| tornik550 |
Jul 26 2016, 05:33 PM
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#6
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Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
Soooo my a-hole doesn't line up with my b-hole. Lo (IMG:style_emoticons/default/lol-2.gif)
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| tornik550 |
Jul 26 2016, 05:33 PM
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#7
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Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
QUOTE(wndsnd @ Jul 26 2016, 07:32 PM)  Why cant you just rotate it? I did rotate it. The holes are close but not where they need to be. |
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| Krieger |
Jul 26 2016, 05:38 PM
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#8
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Advanced Member Group: Members Posts: 4,771 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None
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Thats your problem. Your car has four A holes! (IMG:style_emoticons/default/poke.gif) I wonder if those Sebros are the problem
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| ConeDodger |
Jul 26 2016, 05:43 PM
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#9
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Apex killer! Group: Members Posts: 23,859 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California
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I think, you have to drill and tap a new hole. Which reminds me, I didn't. So apparently you can get away without doing it. The lug nuts hold everything???
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| wndsrfr |
Jul 26 2016, 05:47 PM
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#10
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Senior Member Group: Members Posts: 1,442 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region
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QUOTE(ConeDodger @ Jul 26 2016, 03:43 PM) I think, you have to drill and tap a new hole. Which reminds me, I didn't. So apparently you can get away without doing it. The lug nuts hold everything??? Been running mine without the screws for about 5000 miles of DE's on track over 3 years with zero issues. The lug nuts do the actual clamping of the rotor to the hub. I could possibly see that the little screws might help with centering, but sure haven't noticed any problems. Always, always, always properly torque your lugs....96ft.lb. |
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| BillC |
Jul 26 2016, 05:50 PM
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#11
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Senior Member Group: Members Posts: 579 Joined: 24-April 15 From: Silver Spring, MD Member No.: 18,667 Region Association: MidAtlantic Region
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The retaining screws are not needed. They are just a convenience, to keep the rotor in place when the caliper is removed. As noted above, the lug nuts actually clamp everything together when the wheel is installed.
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| tornik550 |
Jul 26 2016, 05:55 PM
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#12
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Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
Perfect. I could see how those little M6 screws could do much of anything other than keeping them in place with the calipers off. I was afraid that if I just did a diy drill/tap job, it may not be perfectly positioned which would probably just screw things up. So I am glad to hear that I can just run it as is.
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| Spoke |
Jul 27 2016, 07:47 AM
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#13
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Jerry Group: Members Posts: 7,106 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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The securing holes on 911 rotors do not match up with the securing threads on the 914-4 hubs. if you want to use the screws, you'll have to drill and tap the hub for the 911 rotor securing screw holes.
I did this by mounting the rotor holding on with a couple of lugs, and by using the same size drill bit as the diameter of the securing screw holes in the rotor, drill just enough to get an idea of where the center of the mounting holes go. Then remove the rotor and drill the holes out with the proper sized drill for the tap. Tap the holes and you're done. |
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