BRAKES
M6060, M7060, WSM
4-M8
Maximum Braking of Trailer Brake - Braking
Pressure Limited
Flow control valve (10) and control spool (2) have the
same spool positions (a and d) as in the case of partial
braking.
The fluid flows Qp and Qx pass as with partial
braking.
The maximum permissible trailer braking pressure
Pb (e.g. 150 bar) has been reached. An even further
increase of the trailer braking pressure is prevented,
even if the tractor braking pressure rises further. The
pressure relief element (3) is now shifted to the left. The
springs (4), which are pre-loaded to the maximum
permissible trailer braking pressure Pb, are
compressed.
If the trailer braking pressure Pb also rises, e.g.
owing to external factor, control spool (2) momentarily
opens brake line B to the reservoir and avoids further
increasing of the braking pressure.
In all control positions of the trailer brake valve, the
tractor hydraulics can be used and pressurized as
desired through port N. This does not have any important
effect on the trailer brake. The trailer brake has
precedence over the tractor hydraulics. The maximum
pressure of the tractor hydraulics may be higher than the
maximum trailer braking pressure.
9Y1210828BRM0008US0
(1) Piston Surface
(2) Control Spool
(3) Pressure Relief Element
(4) Spring
(5) Bleed Valve
(6) Control Head
(7) Piston
(8) Bore
(9) Throttle
(10) Flow Control Valve
(11) Restrictor
(12) Bore
(13) Check Valve
P: Port for 3P Hydraulic Pump
N: Port for 3P Control Valve
B: Port for Trailer Brake
R: Port for Reservoir
(Transmission Case)
X: Port for Tractor Service
Brake
Qp: Delivery Flow
Qx: Control Flow
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