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TM 9-2330-272-14
4-35. BLEEDING HYDRAULIC BRAKE SYSTEM.
This Task Covers:
a.
Manual Bleeding
b.
Pressure Bleeding
Initial Setup:
Equipment Conditions:
Materials/Parts:
l Semitrailer coupled to towing vehicle (manual bleed-
c Brake fluid (item 8, Appendix E)
ing) (para 2-10).
l Rags (item 14, Appendix E)
. Master cylinder serviced (Chapter 3, Section I).
l Plastic tubing
Tools/Test Equipment:
l General mechanic’s tool kit
Personnel Required: Two
l Common no. 1 shop set
. Quart container
a.
MANUAL BLEEDING
NOTE
Perform this task at each wheel cylinder.
Ensure that fluid level in master cylinder is within )-j in. (13 mm) from top at all times
during task to avoid allowing air to enter hydraulic brake system.
A drain pan should be used to catch any draining brake fluid. Ensure that all spills are
cleaned up.
Plastic tubing should be approximately 18 in. (46 cm) long.
1.
Clean wheel cylinder bleeder valve (1). Connect
plastic tubing (3) to bleeder valve.
NOTE
Ensure that end of plastic tubing remains sub-
merged in brake fluid for entire procedure.
2.
Fill container (2) approximately halfway with brake
fluid and place free end of plastic tubing (3) in
container.
3.
Have an assistant depress and hold brake pedal.
Open wheel cylinder bleeder valve (1), allowing
brake fluid to flow into container (2).
4.
When brake fluid contains no air bubbles, close
wheel cylinder bleeder valve (1) and disconnect
plastic tubing (3).
4-60
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