Operation No. 8 - Inspection Of Braking System Tightness - PRONAR T740 Manual

sideways, if there is an insignificant pressure drop in braking system one should consider the
system to be reliable.
A metallic noise during braking, rapid heating of brake drums, uncontrolled slips sideways,
jerking of trailer, too low air pressure, sudden pressure drop or other symptoms appearing
during braking may be the cause of brake shoe lining wear, damage connectors or conduits,
unreliability of control valve or other serious system faults. In such instances immediately
stop and check condition of connectors and check tightness of system. If fault cannot be
detected and repair is impossible without breach of guarantee, contact service .and conduct
braking system diagnosis and execution of repair.
DANGER
Do not use the trans-shipment trailer with damaged pneumatic system.
Inspection of action of braking system:
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5.2.8 OPERATION NO. 8 – INSPECTION OF BRAKING SYSTEM TIGHTNESS
As a part of trans-shipment trailer maintenance, conduct inspection of individual pneumatic
systems, giving particular attention to all places of connection. Tightness of the system
should be checked at nominal pressure in the system of approx. 5.8 – 6.5 bar in single
conduit systems, and approx. 5.8 MPa in two conduit systems. In order to check system
tightness connect trans-shipment trailer to tractor and if necessary start tractor in order to
bring system to the required pressure. To inspect tightness release brake pedal and press
brake pedal of tractor (the help of the second person is required).
If conduits, seals or other system elements are damaged, compressed air will escape in
these damaged places with a characteristic hiss. Lack of system tightness may be exposed
by covering checked elements with washing fluid or other foaming preparations, which will
not react aggressively with system elements. Damaged seals or conduits, causing leaks
should be replaced. If the cause of the system leak is the outflow from a piston, control valve
body or braking force regulator should be taken to authorised repair provider for repair or
replacement of parts.
daily.
5.12