Massey Ferguson 5400 - Issue 1.a
09I01.10
Unassisted brake master cylinders
E . Double circuit master cylinders
(with trailer brake)
Operation
Pedals uncoupled (Fig. 9)
The effort applied to a pedal is transmitted by the
rod (5) to the piston (4) which moves in the bore of the
active master cylinder. The valve (1) closes the supply
port. The balancing valve (3) is opened by the piston (4)
and valve ball (2). Oil under pressure is directed to the
main brake ports (C) and the pressure balancing
junction (D).
Via the balancing junction, the pressure closes the
valve (3) of the passive master cylinder .
The pressure acting on the piston (4) also makes the
piston (6) move, closing the valve (F).
The oil contained in the chamber (E) is channelled by
connecting pipes to the chamber (E’) and to the
port (B’) via the open valve (F’) of the passive master
cylinder.
The valve (F) and piston (6) assembly quickly reaches
the stop at the base of the active master cylinder.
In this position only the tractor brake is activated; trailer
brake is not activated.
Legend (Fig. 9)
A Trailer brake spool valve control (double circuit)
B Master cylinder level kept constant by the lubri-
cating and booster circuit (Fig. 3)
C Supply to main brake
D Pressure balancing junction
A Trailer brake pressure chamber (double circuit)
F valve (double circuit)
Fig. 8
MA-09-05068A
6 1 54
3 2
EF
AB
DC
Fig. 9
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