TM 5-3805-260-24
Air Chambers and Master Cylinders
The brake system for the tractor has one air chamber
and one hydraulic brake master cylinder. The brake
system for the scraper has one air chamber and one
hydraulic brake master cylinder.
The air chambers activate the pistons of the hydrau-
lic brake master cylinders. Compressed air in air cham-
ber (A) is pushed against diaphragm (B) to move the air
chamber rod (D) out. When the rod is moved out, it will
push on the back of piston (E). The diaphragm and rod
are pushed back by spring (C) when the air pressure is
released.
NOTE: The valves (3) and (11) let about 3 to 6 psi
(20 to 40 kPa) oil pressure to be in the lines. This
pressure will be enough to let the brake pads release
from the brake discs but will keep a small amount of
pressure so that the brake pads will clean them-
selves.
TRACTOR AIR CHAMBER AND MASTER CYLINDER
1. Air line. 2. Master cylinder. 3. Valve. 4. Oil line to
tractor brakes. 5. Air chamber. 6. Stroke indicator.
SCRAPER AIR CHAMBER AND MASTER CYLINDER
7. Master cylinder. 8. Air chamber. 9. Air line.
10. Oil line to scraper brakes. 11. Valve. 12. Stroke
indicator. 13. Quick release valve.
2-138
AIR CHAMBER AND MASTER CYLINDER
A. Air chamber. B. Diaphragm. C. Spring. D. Rod.
E. Piston.
