MT86H
Operation
and
Maintenance
Manual
123
4.8.14 Brake line troubleshooting
No.
Causes
Root
causes
Troubleshooting
methods
1
Service
brake
force
is
insufficient
or
brake
cannot
be
applied
System
pressure
is
insufficient
Start
the
truck
without
stalling
until
the
barometer
indicates
0.85
MPa,
make
it
stall
for
10
minutes.
If
the
pressure
drops
by
more
than
0.15MPa,
the
pipeline
may
leak
or
the
air
chamber
may
be
damaged.
Check
the
pipeline
and
the
air
chamber.
If
the
pressure
reaches
up
to
0.85
M,Pa
(due
to
accuracy
of
barometer),
the
air
dryer
and
the
four
‐
circuit
protection
valve
may
have
failed.
Replace
them.
Brake
valve
is
out
of
work
When
air
exists
in
the
brake
valve
inlet,
depress
the
brake
valve.
If
no
air
is
exhausted
from
the
air
outlet,
replace
the
brake
valve.
Brake
air
chamber
is
damaged
If
there
is
no
problem
with
the
above
valves,
depress
the
brake
pedal.
If
the
brake
air
chamber
11
opening
is
smooth
but
the
brake
air
chamber
push
rod
cannot
be
pushed
out,
replace
the
brake
air
chamber.
2
Parking
brake
can
not
be
release
System
pressure
is
insufficient
Start
the
truck
without
stalling
until
the
barometer
indicates
0.85
MPa,
make
it
stall
for
10
minutes.
If
the
pressure
drops
by
more
than
0.15MPa,
the
pipeline
may
leak
or
the
air
chamber
may
be
damaged.
Check
the
pipeline
and
the
air
chamber.
If
the
pressure
reaches
up
to
0.85
M,Pa
(due
to
accuracy
of
barometer),
the
air
dryer
and
the
four
‐
circuit
protection
valve
may
have
failed.
Replace
them.
Brake
valve
is
out
of
work
When
air
exists
in
the
brake
valve
inlet,
depress
the
brake
valve.
If
no
air
is
exhausted
from
the
air
outlet,
replace
the
brake
valve.
Relay
valve
is
out
of
work
When
air
exists
in
the
relay
valve
inlet
(1
opening)
and
the
brake
valve
relay
valve
(4)
but
(2),
replace
the
relay
valve.
Summary of Contents for MT86H
Page 9: ...MT86H Operation and Maintenance Manual 1 Chapter I Safety ...
Page 10: ...MT86H Operation and Maintenance Manual 2 ...
Page 18: ...MT86H Operation and Maintenance Manual 10 ...
Page 19: ...MT86H Operation and Maintenance Manual 11 Chapter II Product Introduction ...
Page 20: ...MT86H Operation and Maintenance Manual 12 ...
Page 25: ...MT86H Operation and Maintenance Manual 17 Chapter III Operation ...
Page 26: ...MT86H Operation and Maintenance Manual 18 ...
Page 64: ...MT86H Operation and Maintenance Manual 56 ...
Page 142: ...MT86H Operation and Maintenance Manual 134 ...
Page 143: ...MT86H Operation and Maintenance Manual 135 Chapter V Maintenance ...
Page 144: ...MT86H Operation and Maintenance Manual 136 ...
Page 160: ...MT86H Operation and Maintenance Manual 152 3 Lubrication diagram ...
Page 161: ...MT86H Operation and Maintenance Manual 153 Chapter VI Annex ...
Page 165: ...157 6 5 Schematic diagram of electrical system ...