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Caliper Rebuild...starting.............

Discussion in 'XJ Technical Chat' started by Blackfnttruck, Jan 2, 2016.

  1. Blackfnttruck

    Blackfnttruck Member

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    Calipers are out and apart:

    [​IMG]

    Not Too bad inside:

    [​IMG]

    Outside parts cleaned and repainted:

    [​IMG]

    Thanks to Len at XJ4Ever for all the new parts, shipped Priority:

    [​IMG]

    And about 6 pages of detailed instructions, rebuild kits and new brake lines, everything looks really good:

    [​IMG]

    Let the games continue...more latter..
     
    Blackfnttruck, Jan 2, 2016
    #1
    Stumplifter likes this.
  2. Blackfnttruck

    Blackfnttruck Member

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    I assume the grease that came with the kit is for the O-ring seal, but i see some also use it on the whole piston, is that correct? Will that not mix with the brake fluid?
     
    Blackfnttruck, Jan 2, 2016
    #2
  3. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    The grease is for the sliding bush on the caliper. The piston seals should be lubricated with brake fluid prior to inserting the piston into the bore.
     
    Last edited: Jan 2, 2016
    k-moe, Jan 2, 2016
    #3
  4. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    It's the part under the small bellows just below the piston bore in this pic.

     
    k-moe, Jan 2, 2016
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  5. Blackfnttruck

    Blackfnttruck Member

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    Looks a little extreme and not a bike caliper, but i have seen several web pages that show this:

    [​IMG]

    [​IMG]
     
    Blackfnttruck, Jan 2, 2016
    #5
  6. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    Totally unnecessary
     
    hogfiddles, Jan 2, 2016
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  7. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    The brake grease is okay to use on the seals (and the piston), but those two pictures are overkill by far. And certainly do use it on any sliding parts like k-moe indicates.
     
    chacal, Jan 3, 2016
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  8. Blackfnttruck

    Blackfnttruck Member

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    Excellent, thanks for the input, actually been waiting for a reply from XJ4EVER. Everything I've read shows to use it on the seals, including the package, I figured, and have read, a very small amount might be OK on the piston also.
     
    Blackfnttruck, Jan 3, 2016
    #8
  9. Blackfnttruck

    Blackfnttruck Member

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    Applied a small amount of grease to the inner seal and a small film on the piston, only near the top before inserting. New piston, seals on:

    [​IMG]

    Both together and ready to install, plenty of grease on the slide bolt:

    [​IMG]
     
    Blackfnttruck, Jan 6, 2016
    #9
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  10. skiprrdog

    skiprrdog Active Member

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    Looking good. I just started the front calipers on a 1978 XS750, and the first one I tackled today the piston was frozen in the caliper. Tried air... no go. Tried the grease gun on the bleed fitting, and that worked *awesome*! Now I just have to clean all of the grease off!
     
    skiprrdog, Jan 10, 2016
    #10
  11. Blackfnttruck

    Blackfnttruck Member

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    Yea, one of mine was stuck also. It looked pretty bad, So I clamped vise grips at the top and took a large screw driver and hammer, and beat it out. Seemed to work OK, without all the grease, but I was replacing that piston, so I didn't care if I damaged it.

    Good luck with the rebuild.
     
    Blackfnttruck, Jan 10, 2016
    #11
  12. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    You got lucky that the piston didn't get cockeyed and damage the bore.
     
    k-moe, Jan 10, 2016
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