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Rebuild rear brake calipers

Discussion in '365 GT4 2+2/400/412' started by Arvid, Jun 3, 2014.

  1. Arvid

    Arvid Formula Junior
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    May 28, 2012
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    Arvid Andersson
    Yes,better double check it Rick. I have looked through the catalogues with the provided measures but not one of them matches all 3 dimensions.
     
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  3. Piston.Broke

    Piston.Broke Rookie

    Mar 5, 2009
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    Australia
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    Rick
    #27 Piston.Broke, Feb 21, 2016
    Last edited: Feb 21, 2016
    Hi Arvid.

    The mystery deepens...

    I have measured the front brake caliper pistons and the details are as follows:

    42 mm in diameter
    overall height 29.5 mm
    internal bore 22.3 mm

    The calipers (ATE) look like they have been fitted to the car from new. It would appear that a number of BMW ATE calipers from the mid to late 70's also used 4 spot 42 mm calipers. They obviously bolt straight on the same pattern as the normal 40 mm caliper. Externally, they look identical.

    I believe that they may be the same as a 42 mm (4 spot) caliper (ATE) from the following BMW models:

    BMW

    Model Type Year
    2500 00.69-00.77
    2800 00.69-00.77
    2.8 00.75-00.77
    3.0 00.71-00.77
    3.3 00.74-00.77

    All the above models came with standard ATE twin 42 mm piston calipers and the caliper pistons size also seem to match.

    Cheers!

    Piston.Broke
     
  4. Arvid

    Arvid Formula Junior
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    The plot thickens :)

    Rick, this just doesn't add up. I've skimmed through different catalogues and BMW only had 2-pot calipers in 42mm. All their 4-pot of that era where 40mm and the above mentioned BMW-models all came with 4-pot 40mm or 2-pot 42mm.

    In any case the pistons and parts might be the same and parts for the 2-pot 42mm could fit Your 4-pot 42mm.

    Have you sourced the parts needed ?
     
  5. Piston.Broke

    Piston.Broke Rookie

    Mar 5, 2009
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    Thanks Arvid.
    OOPS!
    Spot the obvious error!
    I was referring to the rear (2 spot) 42mm caliper kits for the BMW models mentioned.
    I was hoping to have the calipers professionally rebuilt but unfortunately I cant find any brake specialist (in Australia) who is interested in doing the work. What vehicle used the 4 spot calipers (ATE) with the piston size as described?

    Any ideas?

    Cheers !

    Rick.
     
  6. Arvid

    Arvid Formula Junior
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    Arvid Andersson
    Rick,

    I'm having trouble following you... :) Are Your front calipers 2-pot or 4-pot ? There is no 42mm 4-pot ATE calipers from that era,only 2-pot. Do You want the details for the 40mm 4-pot ?

    Arvid
     
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  8. Piston.Broke

    Piston.Broke Rookie

    Mar 5, 2009
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    Hi Arvid,

    The front calipers are 42mm - 4 piston calipers and they look externally identical to the 'normal' Ferrari 400 - 40mm - 4 piston calipers I have seen.

    I will take your word for it that there were no 42mm - 4 piston calipers made by ATE in the mid to late 70s.

    I will continue my research and if I can find a source for the 42mm - 4 piston calipers, I will let you know. (As everyone else's 365/400/400i/412s appear to have 'standard' 40mm - 4 piston calipers, it is probably somewhat 'academic' to them and I don't think there will be much interest in the outcome.

    Thanks for your help anyway.

    Regards,

    Piston.Broke
     
  9. Arvid

    Arvid Formula Junior
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    #32 Arvid, Feb 22, 2016
    Last edited by a moderator: Sep 7, 2017
    No,don't take my word for it because I can't say without a doubt there where no ATE 4-pot 42mm. They just don't show up in the catalogues. Your car is the exception that breaks the rule :)

    If I where You I would contact ATE Classics and ask for advice. The Germans most certainly know what they are doing. It wouldn't surprise me if they are the same parts as 2-pot 42mm.

    If You look at the attached picture,do they resemble ? The surface against the pads have an unusual uneven surface. These are the ATE pistons that match the measurments.

    Arvid
    Image Unavailable, Please Login
     
  10. Piston.Broke

    Piston.Broke Rookie

    Mar 5, 2009
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    Rick
    Thanks again Arvid.
    Yes, I have already had a look at kit you have in the photos. The pistons size match as you say but my pistons don't have the cut away section.
    Good advice to contact ATE direct.
    I will let you know what I find out.
    Regards,
    Piston.Broke.
     
  11. geffen365gtc/4

    geffen365gtc/4 Karting

    Mar 12, 2005
    178
    I needed some new pistons when doing a brake rebuild on my C4. I just popped one out and took it to a local machine shop. Two days and $40 later I had several in my hand.

    Geffen
     
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  13. Piston.Broke

    Piston.Broke Rookie

    Mar 5, 2009
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    Thanks Geffen,

    That may be my back up plan.

    Cheers!

    Piston.Broke
     
  14. NavFerrari

    NavFerrari Rookie

    Mar 23, 2021
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    Navin.Aziz
    Wow Arvid,

    Cheers mate .This is really cool .Thanks a million mate.


    Sent from my iPhone using FerrariChat.com mobile app
     

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