3660 : BCU Fault. To check & rectify. (D ~~~~~ 3660 : BCU Fault.  3660 ER D/L. Found brake pressure no reading indication. Replaced #3660 BCU. Function test & brake pressure test - OK. Air leak test (0.3 bar/5 min). #3660 BCU S/N : OLD : 1544-290 NEW : 1550-317  Selvan/Lee PT 44169