Skip to main content
S
Sudhanshu
Inspiring
November 11, 2025
Solved

Front Brake Master Cylinder – fitment & spongy lever after upgrade

  • November 11, 2025
  • 42 replies
  • 203 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.

      42 replies

      S
      SudhanshuAuthorAnswer
      Inspiring
      November 11, 2025

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

        S
        SudhanshuAuthor
        Inspiring
        November 11, 2025

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

          S
          SudhanshuAuthor
          Inspiring
          November 11, 2025

          Check the tiny return port in the reservoir isn’t clogged.

          S
          SudhanshuAuthor
          Inspiring
          November 11, 2025

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

          S
          SudhanshuAuthor
          Inspiring
          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 

          sudhanshu_sabharwal
          sudhanshu_sabharwal
          Sudhanshu Sabharwal
          November 20, 2025

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

          sudhanshu_sabharwal
          sudhanshu_sabharwal
          Sudhanshu Sabharwal
          December 11, 2025

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

          sudhanshu_sabharwal
          sudhanshu_sabharwal
          Sudhanshu Sabharwal
          November 20, 2025

          Test level 1

          sudhanshu_sabharwal
          sudhanshu_sabharwal
          Sudhanshu Sabharwal
          December 11, 2025

          trial

          sudhanshu_sabharwal
          sudhanshu_sabharwal
          Sudhanshu Sabharwal
          November 20, 2025

          Test L1

          sudhanshu_sabharwal
          sudhanshu_sabharwal
          Sudhanshu Sabharwal
          December 11, 2025

          Check

          sudhanshu_sabharwal
          sudhanshu_sabharwal
          Sudhanshu Sabharwal
          December 11, 2025

          3rd level

          sudhanshu_sabharwal
          sudhanshu_sabharwal
          Sudhanshu Sabharwal
          November 20, 2025

          Test L1 again

          sudhanshu_sabharwal
          sudhanshu_sabharwal
          Sudhanshu Sabharwal
          December 10, 2025

          Test L1 pagination control

          sudhanshu_sabharwal
          sudhanshu_sabharwal
          Sudhanshu Sabharwal
          January 9, 2026

          L2

          sudhanshu_sabharwal
          sudhanshu_sabharwal
          Sudhanshu Sabharwal
          January 9, 2026

          @sudhanshu_sabharwal L3

          sudhanshu_sabharwal
          sudhanshu_sabharwal
          Sudhanshu Sabharwal
          December 10, 2025

          Test L1 pagination control

          sudhanshu_sabharwal
          sudhanshu_sabharwal
          Sudhanshu Sabharwal
          December 10, 2025

          Test L1 pagination in control

          Show more replies
          Terms & ConditionsCookie settingsAccessibility statement