Dt check found 2511 service brake not ap ~~~~~ Dt check found 2511 service brake not ap     Check and found #2511 Tims show srvicve brake off when at B3 and change to ON after 3sec.Brake cyclic check BCP all within criteria.Further check and found #2511 ABPR slow to energise,change in brake status corresponds with ABPR energise.Checked ABPR coil resistance ok.Swap ABPR to #1511-symptom persist at #2511.Swapped #2511 BCU to #1511 to check BCU internal relay BONR synpton persist at #2511.Swapped #2511 ACU pressure transmitters to #1511-sympton persist at #2511.Swapped #2511 ACU to #1511-sympton transferred.Confirmed no abnormal leak/hunting at ACU.Confirmed in ER,BRER able to energise/de-energise as required.To release for further monitoring.#2511 & #1511 Wheel diameter sek ok. Postulate BONR slow to energise as BCP 2.30bar at B3(BONR energise when BCP>2.07bar rising)B3 BCP within criteria of 2.20 +-0.25bar. Check by Sanip/Deeshan/Faddzal. 22/06/21