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> A Tale of Three Calipers, Tell me about different RIBE hardware
zoomCat
post Jan 16 2022, 12:48 PM
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I'm putting together a pair of rear calipers for a six, which the previous owner had replaced with 911 rears to get the vented disks. He didn't keep the originals, it was back in the 80's and nobody cared.
Here's what I've got so far:

Attached Image

On the left is a rebuilt stock 914/6 left rear. The plan is to add a spacer for vented disks.
In the middle is a 914/6 right rear, which I got years ago that already has a spacer. It will be rebuilt.
On the right is what I think is a right rear Ferrari 308 caliper, because the bleeder is in the wrong place. It can be a donor if absolutely needed. The rears the previous owner had installed are the first candidate for donors.

My question today is about the RIBE hardware.

Attached Image

On the left is the rebuilt stock, on the right is /6 caliper that had a spacer added. The fasteners on the left have sloped shoulders, while the other has more square shoulders, which I see on the front A and M calipers I've got.

What was original, either for the stock calipers or the GT calipers?
Is there any functional difference? Esthetically I'd like to get it all matching and correct before I send it all off to PMB, but that depends on availability.

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Eric_Shea
post Jan 16 2022, 09:08 PM
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Factory 914 six calipers had no spacers and used the “button” head M7x50 and 55 Ribe fasteners. (Caliper on the left)

Factory 914-6/GT “prototype” calipers used both the spacers and the fasteners from the new long wheelbase 911 S with vented rotors on the rear. Those fasteners were M7x60 and 65 “cap” head Ribe. (Caliper in the middle) This early spacer was machined not cast and they have rounded edges with machining marks on them. Remember, this was all new for ATE. Everything was solid rotors up to this point. They didn’t have a 60 or 65mm fastener on all previous calipers. These one off (41 off) prototypes used the 911 stuff all around. These cap head fasteners do not look like A-Caliper fasteners. They look like M7 versions of “M-Caliper” fasteners. M-Calipers used a “cap” head M8 fastener. A-Caliper fasteners are actually M9 versions of our 914-6 M7 button head fastener. M7 fasteners have Ribe R5 bit heads. A-Calipers, again, use an M9 version of our “button” head with a Ribe R6 bit head. Probably one of the more delicate fasteners to get apart because of the smaller bit head and larger M9x1 thread engagement. In contrast, the M8 M-Caliper fasteners use the M8 cap head with a much more robust Ribe R8 bit head. Much easier to remove without damaging.

The last caliper is a Ferrari 308 caliper. (Bleeder positioned under the handbrake arm). (Caliper on the right) These came from the factory with spacers installed. These would be a cast, more form fit spacer as identified by the casting line running around the spacers. By this time ATE spec’d the proper M7 x60 and 65 button head Ribe fasteners to use on these calipers as this was a production unit.

Hope that helps.
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zoomCat   A Tale of Three Calipers   Jan 16 2022, 12:48 PM
BillJ   Waiting on all 4 of my -6 calipers to arrive from ...   Jan 16 2022, 01:23 PM
gandalf_025   This is a factory 6 rear that was rebuilt by PMB a...   Jan 16 2022, 01:23 PM
Eric_Shea   This is a factory 6 rear that was rebuilt by PMB ...   Jan 16 2022, 09:19 PM
gandalf_025   This is a 914-6 gt rear caliper rebuilt by PMB al...   Jan 16 2022, 01:28 PM
Eric_Shea   This is a 914-6 gt rear caliper rebuilt by PMB a...   Jan 16 2022, 09:21 PM
gandalf_025   Then again, you could always make your own hardwa...   Jan 16 2022, 01:50 PM
Eric_Shea   Then again, you could always make your own hardw...   Jan 16 2022, 09:23 PM
PatMc   Then again, you could always make your own hard...   Jan 17 2022, 08:09 AM
gandalf_025   You recall correctly Eric.. I bought these a few...   Jan 17 2022, 09:37 AM
Superhawk996   This is a perfect example of what “NOT” to d...   Jan 17 2022, 11:47 AM
Eric_Shea   This is a perfect example of what “NOT” to ...   Jan 17 2022, 09:51 PM
Superhawk996   Duly noted though that Home Depot fasteners are O...   Jan 19 2022, 09:18 AM
Eric_Shea   Duly noted though that Home Depot fasteners are ...   Jan 19 2022, 12:24 PM
PatMc   Duly noted though that Home Depot fasteners are ...   Jan 19 2022, 04:23 PM
914Sixer   You normally used the hardware that came out of th...   Jan 16 2022, 03:34 PM
mepstein   You normally used the hardware that came out of t...   Jan 16 2022, 04:04 PM
BillJ   You normally used the hardware that came out of ...   Jan 16 2022, 07:47 PM
Eric_Shea   The non vented M calipers can be used on the back...   Jan 16 2022, 09:12 PM
Eric_Shea   Factory 914 six calipers had no spacers and used t...   Jan 16 2022, 09:08 PM
Eric_Shea   Perfect example of early 911 rounded spacers vs...   Jan 16 2022, 09:34 PM
BillJ   I told you Eric would know. Just chuckling in ama...   Jan 17 2022, 08:14 AM
zoomCat   Thanks for all the feedback, Eric in particular fo...   Jan 18 2022, 04:59 PM
PatMc   Now I just have to get the very rusty bleeders o...   Jan 19 2022, 08:50 AM
zoomCat   And for those who might be intested in what a dead...   Jan 18 2022, 06:39 PM
Robarabian   This was an educational thread. Can anyone remind ...   Jan 19 2022, 10:27 AM
Superhawk996   Piston diameter is 38mm for /6 and 33mm for /4 wil...   Jan 19 2022, 11:59 AM
gandalf_025   Bigger pistons, takes larger brake pads and genera...   Jan 19 2022, 12:24 PM


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