TC reported train was slow in pick up. No fault indication. TC performed brake status check at BGB N B station but no fault found. TC checked and confirmed no po wer fault indication. TC reported train unable to reach maxi ~~~~~ L3 ER Data DL Registered Residual Pressure Causing Intermittent Stuck Brake - Replaced ACU. Brake Pressure Test - OK. Limited Movement - OK Old: 1523/124 New: 1539/171 Selvan/Alcus. 17/04/20.