TM-9-2320-280-20-2
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; UNIT MAINTENANCE; VOLUME 2 OF 3
JANUARY 1996
TM-9-2320-280-20-2 - Page 737 of 951
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
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