Results 1 to 5 of 5

Thread: Vintage 911S Caliper Restoration -> Ribe M7

  1. 11-26-2017, 09:41 AM #1
    flat4manbe
    flat4manbe is offline
    Junior Member
    Join Date
    Sep 2017
    Location
    Belgium
    Posts
    9

    Vintage 911S Caliper Restoration -> Ribe M7

    Hi,

    Following the wonderful article from Eric "Neunelfer", I'm rebuilding my 2.0S 1968 brake calipers. Calipers were dismantled, yellow zinc plated, Ribe bolts M8 and M7 received black zinc finition, I get new pistons, new kits...

    Everything OK excepted that I noticed that despite all the RIBE head bolts M8 and M7 are from resistance class 12K (written on the head), all my nuts are from Class 8 ??? Probably not original or ? Also, for 3 rear calipers dismantled, I've 2 type of M7 bolts - 2 sets for 11mm wrench and 1 set for 10mm wrench (metal thickness very narrow). To torque them to 25 ft.lbs (for M8) and 17 ft.lbes (for M7) class 8 seems to low.

    Any source for M7 nuts 12K preferably black Zinc (or yellow) and also M8 which should be easier to find ?
    According to PET 90135297910 should be the reference of the nuts for "S" and "L", available at Stoddard but no description to know if M7 or M6.

    Regards,

    Fred
    Porsche 356 AT2 Coupe 1959
    Porsche 911 2.0S Coupe 1968
    VW Karmann Ghia Coupe 1973
    www.frederic-moreau.net
    Reply With Quote Reply With Quote
  2. 11-27-2017, 05:08 AM #2
    smedley
    smedley is offline
    Senior Member smedley's Avatar
    Join Date
    May 2004
    Posts
    826
    When I dis-assembled my '67S calipers I found the fasteners with too much surface corrosion for my taste, and I threw them away assuming they were 8mm to the eye.

    Only when I went to assemble them after re-plating did I realize they were the weird 7mm! Yikes!

    I exhausted metric suppliers on both sides of the Atlantic looking for 7mm fasteners...let alone grade 12.

    Solution...Domestic, SAE, 5/16 inch, grade 9, Allen head bolts and same grade nuts. 5/16 inch is 7.9mm, but fit in the calipers screw bores.

    Calipers are functioning just fine under heat use with no evidence of expansion issues from the extra .9mm on the bolts.
    Mark Smedley
    '59 VW Typ I
    '69 911T 2.7
    '15 GT3
    '16 Boxster GTS
    Reply With Quote Reply With Quote
  3. 11-27-2017, 05:59 AM #3
    davep
    davep is offline
    Senior Member
    Join Date
    Oct 2008
    Location
    Burford, ON, Canada
    Posts
    4,382
    These metric fastener suppliers must dread our questions now. I was doing the same thing about 10 years ago. I even had plans to have a custom run of bolts made; very expensive. It was cheaper to buy core calipers just for the fasteners.
    Porsche Historian, contact for Kardex & CoA-type Reports
    Addicted since 1975, ESR mbr# 2200 to 2024 03
    Researching Paint codes and Engine Build numbers
    Reply With Quote Reply With Quote
  4. 12-02-2017, 03:09 AM #4
    flat4manbe
    flat4manbe is offline
    Junior Member
    Join Date
    Sep 2017
    Location
    Belgium
    Posts
    9
    Hi,

    Thanks Mark for you answer... it's indeed a solution.

    I ordered the M7 nuts 901.352.979.10 at my Porsche dealer and what I received is OK -> Black M7 nuts resistance class 12K.
    For the M8 nuts N.011.008.8 I received a box with a VW reference (nuts apparently for camshat...) -> Clear Zinc M8 nuts.
    Regarding the M8 fasterners with Ribe head, I received from Porsche bolts with hexagonal head class 12 -> So not conform with original.

    Regards,

    Fred
    Reply With Quote Reply With Quote
  5. 12-02-2017, 04:56 AM #5
    JimmyT
    JimmyT is offline
    Senior Member
    Join Date
    Jan 2005
    Posts
    609
    The M7x55 Ribe bolts are components of this kit.
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules


Message Board Disclaimer and Terms of Use
This is a public forum. Messages posted here can be viewed by the public. The Early 911S Registry is not responsible for messages posted in its online forums, and any message will express the views of the author and not the Early 911S Registry. Use of online forums shall constitute the agreement of the user not to post anything of religious or political content, false and defamatory, inaccurate, abusive, vulgar, hateful, harassing, obscene, profane, sexually oriented, threatening, invasive of a person's privacy, or otherwise to violate the law and the further agreement of the user to be solely responsible for and hold the Early 911S Registry harmless in the event of any claim based on their message. Any viewer who finds a message objectionable should contact us immediately by email. The Early 911S Registry has the ability to remove objectionable messages and we will make every effort to do so, within a reasonable time frame, if we determine that removal is necessary.