TM 9-2330-203-14&P
4-24. BLEEDING HYDRAULIC BRAKE SYSTEM (M197A1 AND M198A1) (Con't).
NOTE
Master cylinder must be kept full during bleeding to prevent air from entering hydraulic system.
4.
Remove filler cap (5) and vent tube assembly (4) from master cylinder (6). Fill master cylinder with brake fluid to
within X in. (13 mm) of top of filler Cap opening.
5.
Open breeder valve (1) by turning counterclockwise ) turn.
6.
Have assistant press and hold brake pedal on towing vehicle. Fluid will be forced through plastic tube (3) to expel
air in jar (2), which will show as bubbles in fluid coming out of plastic tube. Continue to hold brake pedal until air
bubbles do not appear. Ensure that plastic tube remains submerged in brake fluid.
7.
When air bubbles cease, close bleeder valve (1). Remove plastic tube (3).
8.
Repeat steps 1 through 7 for other wheel cylinder (early model only).
9.
Repeat steps 1 through 8 for other wheel.
10.
Replenish brake fluid in master cylinder (6) then install vent tube assembly (4) and filler cap (5).
TA510700
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