TC reported TIMS showed BCU fault momentarily at rear M2. TC did brake status check and reported fau lt clear. ~~~~~ 2508 ER D/L - Done. Found 2508 EM brake pressure intermittent below minimum pressure. Replaced ACU at 2508. Brake pressure test & air leak test (0.4 bar/5 min) - OK. 2508 ACU S/N : OLD : 1032-040. NEW : 1002/004.  Selvan/Lee PT. 08/05/2020.