543/544 TC reported Brake fault at BSD R ~~~~~ 543/544 TC reported Brake fault at BSD R     When 750vdc cut off,B1 to coast,stuck brake.Heavy air leak from solenoid coarse exhaust.Replaced ACU and carried out brakes cyclic/function test-ok. Done by Kumar/Sateesh/Koh. 26/03/20 ACU-Old s/n: 1012-016  New s/n: 1302-129 Not: 2144633 raise to RSW.