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Thread: Brake caliper size??

  1. #1

    Brake caliper size??

    Hi

    Having a moment and can't remember which car has a frt brake caliper piston size of 48mm

    Can anybody help. I think that a T are those size. Actually rebuilding some early Jag xj6 calipers for a buddy of mine and everyone is out of stock on caliper kits ( don't want to use Centric ones )

    Thanks, Rick

  2. #2
    Senior Member
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    Oct 2008
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    Burford, ON, Canada
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    Basically all 911 & 912 from 1969 on into the 80's, including the aluminum S calipers and the later A calipers used on the SC.
    Porsche Historian, contact for Kardex & CoA-type Reports
    Addicted since 1975, ESR mbr# 2200 to 2024 03
    Researching Paint codes and Engine Build numbers

  3. #3
    The 1965 to 1968 cars also had 48mm pistons in the front calipers.

    There are 3 basic Piston designs -

    Early calipers used a 'damper' piston which had an anti-knock back bush and a steel pin in the caliper body.

    Aluminium S calipers used a similar damper piston which is longer than the piston used in the cast iron calipers

    SC Calipers used a simplified piston that dispensed with the knock-back devices.

    The early XJ6 has an unusual Girling Caliper that had 3 x pistons - There was a single 2.25" diameter piston in the outer caliper half and 2 x 1.6" diameter pistons in the inner caliper half.

  4. #4
    Thanks guys I only need the seals and rubber boots so a couple of kits will fix me right up for the Jag They are only 4 pistons per caliper with the 48 mm pistons

  5. #5
    The calipers must be from a Series2 or Series 3 car

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