TM 10-3930-669-20 1.  SERVICE BRAKES DO NOT APPLY OR APPLY SLOWLY (CONT). KNOWN INFO TEST OPTIONS Transmission temperature normal. Hom operates. Brake fluid level correct. Drive axle OK. Brake discs OK. Brake linkage adjustment correct. Master cylinder OK. Voltage test. STE/ICE-R #89. POSSIBLE PROBLEMS REASON FOR QUESTION Master cylinder pressure switch faulty. Transmission inching valve faulty. Wire 27A faulty. Relay R9 ground wire faulty. Wire 27 faulty. Wire 27B faulty. Relay R9 faulty. If  22  to  24  vdc  are  not  present, master   cylinder   pressure   switch is faulty. ¬ 2-398