TM  5-5420-226-20-1 -. Symptom-22 FROM STEP o²_R DETAILED TROUBLESHOOTING PROCEDURE VEHICLE OPERATION -   BRAKES (Continued) / Check master cylinder for   leaks. Firs[ l l Technician (Operator’s Station) Apply 750-900    psi   pressure to   brake    system and   check indicator needle for   loss   of   pressure. Check master cylinder assembly for   leaks    at   the mounting bracket boot, drain plug,    bleeder valve, pipe    plug    and connecting tube    assembly. m ~ IS  master cylinder leaking? / DRAIN PLUG, GAGE CONNECTING ‘TUBE (HIDDEN) BLEED MASTER ‘VALVE CYLINDER 1 / ^L~!- —d n . . . PIPE ^.;..  . PLUG ... I BOOT ‘--:- /COnneCting ~MOUNTING TUBE    ASSEMBLY BRACKET OPERATOR’S STATION Replace leaking master cylinder (page 13-2). I TA107O34 4-345