Home Forums Tech Talk brake master cylinder hone – how fine?

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    • #45406
      Matthew Tangeman
      Participant

      I just bought a brake hone with 220 grit stones.  The finish feels a bit rough.  There are 400 grit stones available. How fine of a finish do I need to get a good seal?

      These are old Freeline’s with 7/8″ Akron Rubber Products cup seals.

       

      Thanks for some heads up.

    • #45650
      Walt Gifford
      Participant

      Bore needs to be polished.

      FAA certified jet engine and aircraft technician,
      Nicholson Speedway class champion 2001,
      Yamaha KT100 Service Center,
      41 years karting experience

    • #45810
      Greg Wright
      Participant

      Scotch-Brite is your friend.

      Greg Wright
      Rapid Racing Inc.
      Vintage B-Stock Pilot
      "When in doubt Gas it, It won't help but it ends the suspense."

    • #45952
      Matthew Tangeman
      Participant

      Thanks guys.  Since I had already d0ne the 220 grit hone, I went through it with 400 grit sandpaper.  Felt really smooth and the pistons travel freely now vs hanging up before on the 220 honed surface.  And the brakes lock up when you want them to…

    • #46205
      Walt Gifford
      Participant

      They make brake grease that helps it retract easy.

      FAA certified jet engine and aircraft technician,
      Nicholson Speedway class champion 2001,
      Yamaha KT100 Service Center,
      41 years karting experience

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