Repair Manual

37
MECHANICAL ELEMENTS CONTROLS
TIGHTNESS CHECKING
The tightness of the servobrake is checked on the vehicle, with the hydraulic circuit
under operation.
Connect the vacuum meter be tween t he
servobrake and the inlet collector by means
of a “ T ” type connector.
The connecting hose of the vacuum
meter shall be as short as possible.
Start the engine and let it idle run for
1min.
Block the air suction hose by means of
the MOT 453 device.
Stop the engine.
Read the indicator.
SERVOBRAKE
If air suction lowers with more than 33 mbar (25 Hg) in 15’period, it means there is a
loss:at the retainer valve - replace the valve or at the servobrake membrane - replace the
servobrake.
Dismount the MOT 453 device.
Dismount the vacuum hose.
Connect the air suction hose to the servobrake.
If the servobrake does not work, but the braking system is working, then the effort on
the brake pedal is increased.
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