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Front and Rear master cylinder diaphrams??

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  • #1

    Front and Rear master cylinder diaphrams??

    So was rebuilding my master cylinders and the disphrams are broken. Am i screwed?

    Anything i can get aftermarket?

    i also needs a rear brake caliper piston. im surprised i could even brake lol


    any help is appreciated
    79 SF
    Tags: None
  • #2
    Like this: http://www.ebay.com/itm/401229529599
    http://www.ebay.com/itm/351955268990
    https://hvccycle.net/yamaha-xs1100-b...on-hvc200106f/

    And, just buy a used master cylinder.
    1979 XS1100F
    2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.

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    • #3
      You are the man!

      can i get a stock part number for a rear diapgrahm and a rear brake piston?
      79 SF

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      • #4
        Welp, got me the front diaphragm and brake piston new.

        Rear brake Diaphragm is just not made anymore i guess.

        anybody got a used one in good condition i can buy?
        79 SF

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        • #5
          Contact Andreas.
          1979 XS1100F
          2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.

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          • #6
            Hey Adelii,

            I don't have one, but looking up the part on the fiche, it's this Yamaha# 1J3-25854-51-00 that you might be able to use/search with on eBay. Boats.net shows it, but also shows it as NOT AVAILABLE either.

            Other machines it was used on were:

            76 XS500c
            77 XS400D; 500D; 750
            78 XS400E;500E; 750E; 1100E
            79 XS400F; 750F; 1100F
            80 XS850G; 1100G
            81 XS850H;1100H
            82 XJ1100

            Good Luck.
            T.C.
            T. C. Gresham
            81SH "Godzilla" . . .1179cc super-rat.
            79SF "The Teacher" . . .basket case!
            History shows again and again,
            How nature points out the folly of men!

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            • #7
              thanks for the help. i ended up purchasing a used rear master cylinder on ebay. Im just praying the diaphragm is ok
              79 SF

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