These can easily unscrew off and be replaced with bleeding your brake fluid. This OEM quality gland nut screen for your ATE tanks.
Socket 36mm Gland Nut, Axle Nut Fits VW Bus T-2 All Years # 012160-T-2
Socket 36mm Gland Nut, Axle Nut Fits VW Square back All Years # 012160-T-3
Socket 36mm Gland Nut, Axle Nut Fits VW Bug Beetle All Years # 012160-BX
Socket 36mm Gland Nut, Axle Nut Fits VW Sand Rail All Years # 012160-SR
Socket 36mm Gland Nut, Axle Nut Fits VW Bug Beetle All Years # 012160-BU
Helping Hand Axle And Gland Nut Tool Fits VW Dune Buggy 1950-1979 # CPR012162-DB