Quantcast Air-Over-Hydraulic Brake System (Semitrailer M270A1)

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3the brake system of the towing vehicle for manual
operations
since
the
brake
pedal
must
be
pressed and released to actuate the system. The mas-
ter
cylinder
reservoir
must
be
kept
full
during
bleed-
ing operations or air will enter the system and make
rebleeding  necessary.
(2) Clean, bleeder swrew (fig. 41) at bottom of brake dust
shield enclosure.
(3)
Place
one
end
of  a  length  of  rubber  tube
over  the
Submerge  the  free  end  of
the  tube
bleeder screw.
in
a
bottle
or
jar
partially
filled
with
hydraulic
brake
fluid.
(4)
Remove
vent
tube
assembly
and
filler
cap
from
top
of
reservoir
of
hydraulic
master
cylinder
17).
Fill
cylinder
with
hydraulic
brake
fluid
to
within
inch of top.
(5) While brake pedal on towing vehicle is being pumped
slowly
up
and
down,
open
bleeder
screw
by
three-
quarter turn clockwise. Liquid will be forced through
line
to
expel
air
which
will
show
in
bottle  or  jar
Repeat  op-
as bubbles in fluid coming out of tube.
eration  approximately  10  times.
(6)
Observe
flow,
keeping
tube
submerged
in
fluid.
When
air bubbles cease and stream is a clean, solid mass,
Remove tube.
close bleeder screw tightly.
(7) Repeat operation at each wheel, replenishing the fluid
in  master  cylinder  reservoir  as  necessary.
(8)
Install
filler
cap
and
vent
tube
assembly
17)
in
c.
Refilling
Hydraulic
Brake
System.
(1)
Prior  to  refilling,  the  entire  hydraulic  brake  system
should  be  flushed  with  clean  denatured  alcohol.
C a u t i o n : Use denatured alcohol only, as other clean-
ing agents will swell and soften rubber parts in the
system  necessitating  replacement  of  the  part.
To
flush,
remove
vent
tube
assembly
and
filler cap from top of hydraulic master cylinder and
fill
cylinder
with
denatured
alcohol.
As
in
(h above) open each wheel cylinder bleeder screw in
turn and pump brake slowly until the passage of clean
fluid
indicates
a
clean
system.
After
flushing,
repeat
process
with
clean
hydraulic
fluid
to
force
all
of
the
flushing
agent
from
the
system.
103
TAGO 1321B



 


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