Massey Ferguson 5400 - Issue 1.a
09I02.11
Assisted brake master cylinders
D . Brake master cylinders
Operation (Fig. 1 and Fig. 8)
The force applied to the brake pedal is transmitted by
rod (2) and moves the spool (3) in the bore of the
piston (4).
The oil under pressure coming from the port (A) enters
the bores (10) and the groove (12).
The piston (4) is then pushed to the left, compressing
the master cylinder oil (8) which is then directed
through port (D) to the brake or FTE valve (if fitted).
The screw (7) guides the piston (4) along its move-
ment axis.
N
OTE: Under no circumstances should this screw (7)
be removed.
When the brake pedal is released, the spool (3) tries to
return to its initial position. The oil under pressure thus
no longer reaches piston (4) and it therefore likewise
returns to its rest position.
The valve (6) allows the pressure between master
cylinder (8) and the tank (5) to be balanced only once
the piston has returned.
The port (9) allows oil flow in order to maintain a
constant level in the master cylinder.
The oil under pressure (17 bar) in chamber B also
tends to fill tank (5) by passing through the bore (11).
Port C removes any excess oil and directs it to the
tank.
N
OTE: Under no circumstances should the master
cylinders be disassembled: they should be systemati-
cally replaced.
Fig. 7
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