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SWB Rear Brake Caliper Bolt Spacing...

Hello Guys...

Has anyone retrofitted Boxster brakes to a SWB car? Seems like all the vendors sell are for '69-on.

What is the bolt spacing on the LWB cars? 3"?

What is the bolt spacing on the SWB cars?

Then what is the difference on the SWB cars? What other differences are there such that no one makes an adapter?

Thanks.

Sprint.

Old 01-27-2004, 04:44 PM
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SWB cars used Ate 'L' calipers on the rear which have 2.5" bolt spacing.
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Warren Hall, Jr.

1973 911S Targa ... 'Annie'
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Old 01-27-2004, 05:00 PM
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Quote:
Originally posted by Early_S_Man
SWB cars used Ate 'L' calipers on the rear which have 2.5" bolt spacing.
Thanks Warren! But the setup is otherwise similar? Anything else different save for the shorter arm and smaller bolt spacing?

And just curious. Is 2.5" an exact measurement or an approximation? I thought the Germans are metric? They measure most stuff in mm, right?

Goodnight!

Sprint.
Old 01-27-2004, 05:41 PM
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2.5" is an approximation, as are ...

3.0" spacing for Ate 'M' calipers ...

3.5" spacing for Ate 'S' amd 'A' calipers ...
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Warren Hall, Jr.

1973 911S Targa ... 'Annie'
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Old 01-28-2004, 02:00 AM
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2.5" is an approximation, as are ...3.0" spacing for Ate 'M' calipers ..3.5" spacing for Ate 'S' amd 'A' calipers ....
I beg to differ, I have no knowledge of the "L" calipers and have never even seen one outside of a picture, but "A" and "M" are certainly 3.5" and 3" respectively
Here are the relevent portions of the Ate catalog


dimension "F" was 76.2mm = 3" on "M" and 88.9mm = 3.5" on "A"

Inch measurements were not uncommon on older designs, another example is wheels
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Last edited by Bill Verburg; 01-28-2004 at 04:23 AM..
Old 01-28-2004, 03:30 AM
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Quote:
Originally posted by Bill Verburg

dimension "F" was 76.2mm = 3" on "M" and 88.9mm = 3.5" on "A"

Inch measurements were not uncommon on older designs, another example is wheels
Nice chart and example, Bill. Would you happen to have similar info about the L caliper?

Thanks.

Sprint.
Old 01-28-2004, 09:16 AM
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Would you happen to have similar info about the L caliper?
No, that was before my time. The 914 guys and early 911 guys are the most common users
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Old 01-28-2004, 11:44 AM
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Quote:
Originally posted by Bill Verburg
No, that was before my time. The 914 guys and early 911 guys are the most common users
Thanks Bill! Anyway, I have a question about SWB brake upgrades for ya.... Was wondering if I should post it here (since it's a SWB thread) or PM ya? Thanks and goodnight.

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Old 01-28-2004, 05:22 PM
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