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Master cylinder rebore ..

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  • Master cylinder rebore ..

    At the moment I am fitting a double disc and Brembo's to a 2015 Triumph Thruxton. As the master cylinder is 11mm in stock form my guess is the volume of the pump will not be sufficient as it now must activate 8 pistons instead of only 2. Triumph made a very clever (?) master cylinder which incorporates the part in which the right hand side handlebar electrics are (starter button and so on) . As I want to leave that as stock as possible my idea is to bore the mc again to 14or15mm or 5/8". I am now in doubt of how the pressure is applied.. The piston in the mc has two seals: one on the lever side and one on the brakeline side. Is the pressure generated by the brakeline side seal movement or by by the volume between both seals?
    XS1100 3X0 '82 restomod, 2H9 '78 chain drive racer, 3H3 '79 customized.
    MV Agusta Brutale 910R '06.
    Triumph 1200 Speed Trophy '91, Triumph 1200 '93.
    Z1 '73 restomod, Z1A '74 yellow/green, KZ900 A4 '76 green.
    Yamaha MT-09 Tracer '15 grey.
    Kawasaki Z1300 DFI '84 modified, red.

  • #2
    I'm pretty sure the pressure is on the brakeline side of the rubber cup, which sits over the star shaped valve apparatus, on the end of the piston.
    Ken Talbot

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    • #3
      Originally posted by Ken Talbot View Post
      I'm pretty sure the pressure is on the brakeline side of the rubber cup, which sits over the star shaped valve apparatus, on the end of the piston.
      Thnx Ken !
      XS1100 3X0 '82 restomod, 2H9 '78 chain drive racer, 3H3 '79 customized.
      MV Agusta Brutale 910R '06.
      Triumph 1200 Speed Trophy '91, Triumph 1200 '93.
      Z1 '73 restomod, Z1A '74 yellow/green, KZ900 A4 '76 green.
      Yamaha MT-09 Tracer '15 grey.
      Kawasaki Z1300 DFI '84 modified, red.

      Comment

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