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Posted by: n2j2ryan Feb 12 2018, 10:14 PM

After many suggestions and a visit to a machine shop, I decided with this solution. I tapped out one end from the 7mm hole to a an 8mm thread. The other end I just bored out to 8mm. It now takes an 8mm socket head bolt, without a nut, just like the later callipers. Total cost of all bolts $12, instead of the $16 per bolt plus delivery from the UK.

Posted by: 914Sixer Feb 12 2018, 10:37 PM

Looks like a working solution to me.

Posted by: Valy Feb 13 2018, 08:43 AM

Posted by: GeorgeRud Feb 13 2018, 10:40 AM

Makes you wonder why Ate chose such a strange bolt initially when producing these. Eric?

Posted by: mepstein Feb 13 2018, 11:19 AM

I have some 7mm bolts on my '70's motorcycles. I don't think it was a strange size back in the day. Over time, things changed.

Posted by: oldie914 Feb 13 2018, 12:11 PM

I think Ate used the odd bolt size to keep somebody from rebuilding the calipers with the wrong (low strength) bolts. 7mm is a very strange bolt size and was probably only available from Ate. I am sure they would not sell them to everybody back then.
The calipers on my 1997 Mercedes are attached with bolts with 18mm heads. I think it has the same purpose.

Posted by: gothspeed Feb 13 2018, 02:37 PM

This makes a lot of sense as the 7mm bolt holes are on the sloppy side. If you ream the holes to barely accommodate 8mm bolts, the assembly will be plenty strong.

Posted by: cwpeden Feb 14 2018, 11:38 AM

Hi, I'm in Victoria too. Sorry I didn't see this sooner.

If you need any 914 help call or send me a text. I have one of the local parts hoards....including brake caliper bolts.

two5zero 8eight6 9one44

Posted by: Dave_Darling Feb 15 2018, 01:20 PM

I think it's just that newer M-B cars have transitioned to JIS-spec hardware instead of DIN-spec.

--DD

Posted by: austriafisch0 Feb 18 2018, 08:46 AM

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