TM 10-3930-669-20 2.  SERVICE BRAKES DO NOT RELEASE OR RELEASE SLOWLY (CONT). KNOWN INFO Brake fluid OK. POSSIBLE PROBLEMS Master cylinder faulty. Drive axle faulty. KNOWN INFO Brake fluid OK. Master cylinder OK. POSSIBLE PROBLEMS Drive axle faulty. TEST OPTIONS Pressure test. STE/ICE.R #50. REASON FOR QUESTION If 0 psi (O kPa) is not present, master cylinder is faulty. TEST OPTIONS Brake disc check. REASON FOR QUESTION If 0.079 in.  (2 mm) is not measured, drive axle is faulty. 2-410