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What rear caliper has 48MM piston

Does anybody know what 2 piston ATE cailper for the rear of a 911 has a 48MM piston. Thanks in advance.

Old 06-29-2004, 01:07 PM
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I think it could be the M caliper. first used in the rear on Carreras. pretty sure it uses the same size PAD as the earlier Ate rear caliper. If nobody else chimes in I will double check my M's when I get home.
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Old 06-29-2004, 01:18 PM
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Hello,
From ATE for rear 911 application: none. The largest 2 piston cast iron (steel) caliper has 42 mmm (3.2 911).
Regards,
J.P.
Ps. The fronts have 48 mm (3.2 911).
Old 06-29-2004, 01:20 PM
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yep he's correct. the M caliper is 42mm, A caliper 48mm, and S caliper is 48mm.

note: the M caliper has 3" bolt spacing, the A and S have 3.5"
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1995 993 becoming an RS (gran prix white)
Old 06-29-2004, 01:25 PM
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What are you trying to do, Jeremy?
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Old 06-29-2004, 01:35 PM
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A friend needs to purchase a caliper kit for these unknown rear calipers.
So these could be A front calipers mounted on the rear?
Old 06-29-2004, 01:42 PM
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In all likelihood, yes, especially if the calipers have 3.5" hole spacing (mounting would have to be modified). What does he have on the front? Hopefully something bigger than an 'A'.
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Old 06-29-2004, 01:59 PM
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You will find data on 911 brakes here

There are 48mm piston Ate calipers w/ 3" ears but they were never oem on any Porsche

There are several versions of the M caliper differing in piston size, mount dimension and throat size

There are versions of the M caliper w/ 3.5" mounts which can be bolted to 930 trailing arms.

A calipers are noticably larger than Ms , there are pics on the link I posted.
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Old 06-30-2004, 05:39 AM
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The brake oracle has spoken!
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Old 06-30-2004, 06:27 AM
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Thanks Bill, great link! Thanks to the rest for your input as well.
Old 06-30-2004, 06:46 AM
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I stumbled across this thread since I am in the same situation described above. The car I have (69E) came with Ate 51R rear calipers with have the 3" ear spacing with 48mm pistons. I need to get a seal kit for at least one of them. Can anyone help me with identifying what car these came from so I can find the parts?

Thanks
Darren
Old 11-19-2013, 09:32 AM
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Quote:
Originally Posted by DJThom View Post
I stumbled across this thread since I am in the same situation described above. The car I have (69E) came with Ate 51R rear calipers with have the 3" ear spacing with 48mm pistons. I need to get a seal kit for at least one of them. Can anyone help me with identifying what car these came from so I can find the parts?

Thanks
Darren
They are M fronts from any year, you really should replace them w/ the correct rar 38mm M rears

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Old 11-19-2013, 10:00 AM
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