TM 5-3825-226-24
BRAKES SYSTEM
AIR SYSTEM AND BRAKE SCHEMATIC WATER DISTRIBUTOR
1. Air line from brake valve on tractor. 2. Brake oil line to right wheel brake. 3. Quick release valve. 4. Air
chamber and master cylinder, 5. Residual pressure valve (check valve). 6. Brake oil line to left wheel
brake.
AIR FLOW
The tractor and water distributor have identical air-
activated
hydraulic
brake
systems.
They
are
independent systems (not connected). Air from the
brake control valve's lower chamber goes to the water
distributor brake chamber. Air from the brake control
valve's upper chamber goes to the tractor brake
chamber.
OIL FLOW
The hydraulic brake system for each machine has its
own master cylinder, brake lines and caliper assemblies.
Each master cylinder has its own fluid reservoir, and
maintenance
for
each
machine
must
be
done
separately.
As the air chamber rod is extended, it pushes the master
cylinder piston. Piston movement sends oil through the
lines into the caliper assemblies. At each caliper the oil
pushes on the back of the pistons, and the pistons push
the friction pads against the brake discs.
When the brake pedal is released, the air pressure
against the brake master cylinder is relieved (let out).
The master cylinder piston is retracted and hydraulic oil
pressure is let off of the caliper pistons. The residual
pressure valves (check valves) keep a 3 to 6 psi (20 to
40 kPa) back pressure on the pads to keep them against
the discs. The pistons and pads are not returned by
springs. They release automatically. The pads do not
move away from the discs, so no adjustment is needed
when the pads begin to wear.
5-14
