TM 9-2320-387-24-I
7-2. SERVICE BRAKE SYSTEM BLEEDING INSTRUCTIONS (Co&d)
I
1 b. ~%x~ual Bleeding
1
.
.
NOTE
This procedure covers bleeding at one wheel. Repeat bleeding
task for remaining wheels.
Assistant is required to depress the brake pedal when manually
bleeding brakes while mechanic opens and closes bleeder screw.
1.
Remove protective cap (1) from bleeder screw (2) on caliper assembly (3).
2.
Connect short piece of hose (4) to bleeder screw (2) and place other end of hose (4) in container
3/4full of brake fluid.
CAUTION
l Check the master cylinder fluid level frequently during the
bleeding operation and refill the reservoirs 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.
l Af%er adding silicone brake fluid to master cylinder, let cylinder
sit undisturbed for 30 minutes minimum to ensure all visible as
well as minute air bubbles are gone.
3.
Have assistant pump brake pedal toward floor and hold it there. Open bleeder screw (2) 3/4-turn.
4.
When pedal reaches floor, tighten bleeder screw (2) and have assistant slowly release brake pedal.
5.
Repeat steps 3 and 4 until fluid flows clear and free of air bubbles.
6.
Disconnect hose (4) from bleeder screw (2) and install protective cap (1) on bleeder screw (2).
c. Master Cylinder Bleeding
NOTE
Perform this procedure prior to installing master cylinder on vehicle.
1.
Secure master cylinder flange (9) in vise.
2.
Remove cover (5) and fll reservoirs (6) with silicone brake fluid.
3.
Install threaded end of one bleeder hose (7) into brake line port on master cylinder (10) and insert
opposite end into reservoir (6). Repeat step for other bleeder hose (7).
4.
Slowly push piston (8) into master cylinder (10). Do not release piston (8). While holding piston (81,
pinch bleeder hoses (7) off and release piston (8). Piston (8) will return automatically.
CAUTION
Whenever the master cylinder is Wed with silicone brake fluid, let
cylinder sit undisturbed for 30 minutes minimum to ensure all
visible as well as minute air bubbles are gone.
5.
Refill reservoirs (6) with silicone brake fluid and repeat steps 3 and 4 until no air bubbles remain in
brake fluid.
6.
Remove two bleeder hoses (7) from brake line ports on master cylinder (10).
7.
Install cover (5) on master cylinder (10) and remove from tie.
8.
Install master cylinder (para 7-5).
7-4
