dt545/546 Undershoot546 reported undershoot from our annalysis we found got abnormal aking. Pls check both side braking emu 545 and emu 546 ~~~~~ 3546 reported undershoot from our annalysis we found abnormal braking. Pls check both side braking emu 545 and emu 546.  1546 ACU replaced & function test - OK. No residual pressure at COAST, no air leak & brake pressure within criteria - OK. Limited movement/depot shunting - OK. No fault re-occur. 1546 ACU S/N : OLD : 1302/126                   NEW : 1037/046 RF  : 1733/418                   RF  : 1902/633 RC  : 1733/409                   RC  : 1902/630 AF  : 1733/848                   AF  : 1909/993 EM  : 1733/199                   EM  : 1902/854 AC  : 1733/850                   AC  : 1847/958  Sarma/Rasul 43890