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Community Manager
Sudhanshu
Community Manager
November 11, 2025
Solved

Front Brake Master Cylinder – fitment & spongy lever after upgrade

  • November 11, 2025
  • 40 replies
  • 260 views

Replacing stock master cylinder with an aftermarket unit. Lever feels a bit spongy even after a quick bleed. Looking for best-practice on piston size, banjo/crush washers, ABS compatibility, and bleed order.

    Best answer by Sudhanshu

    Full bleed order matters on ABS bikes: MC → ABS module → calipers. Vacuum + reverse bleed helps.

    40 replies

    S
    Community Manager
    SudhanshuAuthorAnswer
    Community Manager
    November 11, 2025

    Full bleed order matters on ABS bikes: MC → ABS module → calipers. Vacuum + reverse bleed helps.

      S
      Community Manager
      SudhanshuAuthor
      Community Manager
      November 11, 2025

      If lever firms up then fades, air is trapped in the ABS modulator—cycle it.

        sudhanshu_sabharwal
        sudhanshu_sabharwal
        Sudhanshu Sabharwal
        January 22, 2026

        @sudhanshu_sabharwal Bed pads properly; glazed pads can feel vague.

        Gainsight Product manager
        S
        Community Manager
        SudhanshuAuthor
        Community Manager
        November 11, 2025

        Quick data point: swapping in fresh crush washers and re-torquing the banjo stopped the slow lever creep for me.

        sudhanshu_sabharwal
        sudhanshu_sabharwal
        Sudhanshu Sabharwal
        December 10, 2025

        Testing L2 single page 

        Gainsight Product manager
          sudhanshu_sabharwal
          sudhanshu_sabharwal
          Sudhanshu Sabharwal
          November 20, 2025

          Reverse-bleed from caliper with a syringe to push air up

          Gainsight Product manager
          sudhanshu_sabharwal
          sudhanshu_sabharwal
          Sudhanshu Sabharwal
          December 11, 2025

          your final bleed order/torques; it helps the next service.

          Gainsight Product manager
            sudhanshu_sabharwal
            sudhanshu_sabharwal
            Sudhanshu Sabharwal
            November 20, 2025

            Test level 1

            Gainsight Product manager
              sudhanshu_sabharwal
              sudhanshu_sabharwal
              Sudhanshu Sabharwal
              December 11, 2025

              trial

              Gainsight Product manager
                sudhanshu_sabharwal
                sudhanshu_sabharwal
                Sudhanshu Sabharwal
                November 20, 2025

                Test L1

                Gainsight Product manager
                sudhanshu_sabharwal
                sudhanshu_sabharwal
                Sudhanshu Sabharwal
                December 11, 2025

                Check

                Gainsight Product manager
                  sudhanshu_sabharwal
                  sudhanshu_sabharwal
                  Sudhanshu Sabharwal
                  December 11, 2025

                  3rd level

                  Gainsight Product manager
                    sudhanshu_sabharwal
                    sudhanshu_sabharwal
                    Sudhanshu Sabharwal
                    November 20, 2025

                    Test L1 again

                    Gainsight Product manager
                    sudhanshu_sabharwal
                    sudhanshu_sabharwal
                    Sudhanshu Sabharwal
                    December 10, 2025

                    Test L1 pagination control

                    Gainsight Product manager
                    sudhanshu_sabharwal
                    sudhanshu_sabharwal
                    Sudhanshu Sabharwal
                    January 9, 2026

                    L2

                    Gainsight Product manager
                      sudhanshu_sabharwal
                      sudhanshu_sabharwal
                      Sudhanshu Sabharwal
                      January 9, 2026

                      @sudhanshu_sabharwal L3

                      Gainsight Product manager
                        sudhanshu_sabharwal
                        sudhanshu_sabharwal
                        Sudhanshu Sabharwal
                        December 10, 2025

                        Test L1 pagination control

                        Gainsight Product manager
                        sudhanshu_sabharwal
                        sudhanshu_sabharwal
                        Sudhanshu Sabharwal
                        December 10, 2025

                        Test L1 pagination in control

                        Gainsight Product manager
                        sudhanshu_sabharwal
                        sudhanshu_sabharwal
                        Sudhanshu Sabharwal
                        December 10, 2025

                        Test L1 pagination in control

                        Gainsight Product manager
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