TM 5-3805-260-24
AIR REMOVAL FROM BRAKES
(Bleeding the Brakes)
VALVES THAT LET THE AIR OUT (TRACTOR
BRAKES)
(Bleed Screws)
Let the air out of system for the wheel brakes
which is activated by the master cylinder.
1.
Check the fluid level in the reservoir. The
primary level must be .5 in. (12.7 mm) from the
top of the reservoir.
NOTE: To keep air out of the master cylinder, fluid must
always be seen in the reservoir while air is being let out
of the system. When filling an empty system, loosen the
caps on the master cylinders until fluid comes out, then
tighten the caps.
2.
Fasten .25 in. (6.4 mm) ID. (inside dimension)
hoses to the bleed screws that lets the air out.
Put the loose end of the hoses into ajar that has
enough fluid in it so that the end of the hoses are
under the surface of the fluid.
3.
Push the brake pedal down and release it
several times until the indicator rods make a
shorter stroke.
4.
Keep the brake pedal down and look at the
indicator rod.
5.
Open the bleed screws that lets the air out and
look at the fluid that comes out of the hoses.
Close the bleed screws when the indicator rod is
extended 1.44 in. (36.6 mm).
6.
Do Steps 3, 4, and 5 until the fluid that goes out
of the hoses has no air bubbles.
7.
Fill the reservoir to .50 in. (12.7 mm) from the
top of the reservoir when necessary.
8.
If necessary do the above procedure for the
scraper.
VALVES THAT LET THE AIR OUT (SCRAPER
BRAKES)
(Bleed Screws)
2-154
