TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 2 Download
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7-13. MASTER CYLINDER MAINTENANCE This task covers: a. Removal c. Bleeding b. Installation INITIAL SETUP: Tools General mechanic’s tool kit: automotive (Appendix B, Item 1) Materials Parts Five locknuts (Appendix G, Item 128) Personnel Required One mechanic One assistant Manual References TM 9-2320-280-10 TM 9-2320-280-24P Equipment Condition Hood raised and secured (TM 9-2320-280-10). CAUTION Cover or plug all open lines and connections immediately after disconnection to prevent contamination. Remove all plugs prior to connection. NOTE Have drainage container ready to catch brake fluid. 1. Disconnect brake lines (5) and (6) from master cylinder (2). 2. Remove locknut (3), washer (4), and proportioning valve bracket (8) from right master cylinder mounting stud (10). Discard locknut (3). 3. Remove locknut (14), washer (11), capscrew (12), and washer (11) from bracket (17) and splash shield (13). 4. Remove locknut (15), washer (16), and bracket (17) from hydro-boost (1). Discard locknut (15). CAUTION Do not lean on master cylinder. 5. Remove two locknuts (9) and master cylinder (2) from hydro-boost (1). Discard locknuts (9). CAUTION Ensure O-ring is properly seated on master cylinder prior to installation. Damage to master cylinder may result if O-ring is not properly seated. 1. Install master cylinder (2) on hydro-boost (1) with two locknuts (9). Tighten locknuts (9) to 22 lb-ft (30 N• m). 2. Install bracket (17) on hydro-boost (1) with washer (16) and locknut (15). Tighten locknut (15) to 22 lb-ft (30 N• m). 3. Install bracket (17) on splash shield (13) with washer (11), capscrew (12), washer (11), and locknut (14). Tighten locknut (14) to 26 lb-ft (35 N• m). 4. Install proportioning valve bracket (8) on stud (10) with washer (4) and locknut (3). Tighten locknut (3) to 22 lb-ft (30 N• m). 5. Connect brake lines (5) and (6) to master cylinder (2). b. Installation a. Removal TM 9-2320-280-20-2 7-28 Change 3