TM10-3930-660-20 12-8. SERVICE BRAKE HYDRAULIC ACCUMULATOR - REPLACE/REPAIR/TEST (Cont’d) Wipe the area clean around all hydraulic connections to be opened during removal and disassembly. Cap oil lines and plug holes after removing lines. Contamination of the hydraulic system could result in premature failure. If more than one hydraulic line is to be removed, identify lines to assure proper installation. Use suitable container to catch any hydraulic oil that may drain from  system. 1. PUMP BRAKE PEDAL TO RELIEVE SERVICE BRAKE HYDRAULIC ACCUMULATOR PRESSURE. With the engine stopped, pump the brake pedal until no power assistance is felt through the pedal. This will require approximately 20 depressions of the brake pedal. The accumulator is located under the cab, behind tool box. 2. DRAIN HYDRAULIC OIL FROM SERVICE BRAKE HYDRAULIC ACCUMULATOR (1). a. b. c. Place suitable bucket under accumulator (l). Disconnect hydraulic hose (2) from adapter (3) at bottom of accumulator (l). Allow accumulator (1) to drain completely. 12-23