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GSX Dual Piston Caliper slide pin thread pitch

Posted by jinscho, Feb 24, 2019

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  1. jinscho

    jinscho Proven Member

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    Joined Jun 16, 2017
    Bangor, Pennsylvania
    I just finished rebuilding a set of GSX calipers I picked up and one of the slide pins has a flat spot on the threads that I'd like to clean up quick. My tap and die set only goes up to 14x1.5 on the metric side and it looks like I'm going to need a 15 or 16mm die for this.

    Can anyone confirm the thread pitch for the slide pins on a 2G dual piston caliper?

    Thanks!
     

    Street Build 2K  12

    1999 Mitsubishi Eclipse Spyder N/T
    fwd · manual · 2G DSM
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  2. DSMPT

    DSMPT Proven Member

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    Joined Jun 12, 2014
    Japan / Mexico, Arizona
    It should be M15x1.50. But just in case you better check yours by yourself. Some 1Gs or GVR4 single piston have M14x1.25.
     

    Drag Race Build 1K  2

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    Street Build 1K  4

    1998 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
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  3. jinscho

    jinscho Proven Member

    288
    97
    Joined Jun 16, 2017
    Bangor, Pennsylvania
    It's definitely not an M14x1.25. I grabbed the biggest die in my set (M14x1.5) just to see if it was in the proper size range and it was too small. M15 makes sense in my head but are you certain on the 1.5 pitch?
     

    Street Build 2K  12

    1999 Mitsubishi Eclipse Spyder N/T
    fwd · manual · 2G DSM
    Loading...
  4. DSMPT

    DSMPT Proven Member

    528
    181
    Joined Jun 12, 2014
    Japan / Mexico, Arizona
    M15 is for sure. I mean Mitsubishi catalog shows 1G gsx, 2G gsx both M15, so supposed to be M15. but I just checked a single piston caliper from 90 gsx that lying in my garage and it has M14 (maybe this caliper is from 1G non turbo). I also checked a dual piston caliper (I don't remember if it was from 1g or 2g gsx) and it has M15 x 1.5 thread pitch.
     
    Last edited: Feb 24, 2019

    Drag Race Build 1K  2

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    Street Build 1K  4

    1998 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
    Loading...
    jinscho likes this.

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