TB 9-2320-335-13&P
7-2.1. SERVICE BRAKE SYSTEM BLEEDING INSTRUCTIONS
(SERIAL NUMBERS 300000 AND ABOVE)
This task covers:
a. Pressure Bleeding
c. Master Cylinder Bleeding
b. Manual Bleeding
INITIAL SETUP:
Tools
Manual References
General mechanic's tool kit:
TM 9-2320-387-10
automotive (Appendix B, Item 1)
TB 9-2320-335-13&P, Appendix E
Materials/Parts
Equipment Condition
Brake fluid (Appendix C, Item 18)
Hood raised and secured (TM 9-2320-387-10).
Master cylinder filled to proper level
Personnel Required
(Table 2-1, Item 2).
One mechanic
General Safety Instructions
One assistant (task b. only)
Always wear eye protection when bleeding brakes.
Maintenance Level
Unit
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.
a. Pressure Bleeding
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.
7-2
