Covering the politics, Business and technology of defense - Subscribe Today

TB-9-2320-335-13&P HMMWV Operator and Field Maintenance, Parts, Tools M1151A1 M1152A1 M1165A1 Download

Page 182 of 680

7-2.1. SERVICE BRAKE SYSTEM BLEEDING INSTRUCTIONS (SERIAL NUMBERS 300000 AND ABOVE) 7-2 This task covers: a. Pressure Bleeding c. Master Cylinder Bleeding b. Manual Bleeding WARNING Always wear eye protection when bleeding brakes. Failure to do so may cause injury if brake fluid comes in contact with eyes. CAUTION Both sides of each caliper will need to be bled. Do not bleed only one side of brake caliper or brakes may not operate properly. NOTE • If only the front or rear half of the system has been serviced, it is usually necessary to bleed only that half of the system. However, if a firm brake pedal cannot be obtained after bleeding, it will be necessary to bleed the entire system. • Bleed brakes in the following order: right rear, left rear, right front, left front. • Bleeding procedures for all four brake calipers are basically the same. These procedures cover bleeding of right rear caliper. Repeat procedure for each caliper, as necessary. • Bleed calipers (pressure and manual) from top bleeder screws only, bottom bleeder screws are for universal caliper replacement. CAUTION • When using a pressure tank, follow the manufacturer's instructions for its use. Do not exceed the recommended working pressure when pressurizing the tank. A tank pressure of 12-15 psi (103-138 kPa) is sufficient to bleed the brake hydraulic system. Release all air pressure from the tank after using it. • Check the master cylinder fluid level frequently during the pressure bleeding procedure and refill the reservoir as necessary. Do not allow the master cylinder to run out of fluid at any time or additional air will be drawn into the system. a. Pressure Bleeding Tools General mechanic’s tool kit: automotive (Appendix B, Item 1) Materials/Parts Brake fluid (Appendix C, Item 18) Personnel Required One mechanic One assistant (task b. only) Manual References TM 9-2320-387-10 TB 9-2320-335-13&P, Appendix E Equipment Condition • Hood raised and secured (TM 9-2320-387-10). • Master cylinder filled to proper level (Table 2-1, Item 2). General Safety Instructions Always wear eye protection when bleeding brakes. Maintenance Level Unit INITIAL SETUP: TB 9-2320-335-13&P