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Brake Hydraulic Master  Cylinders  and  Air  Chambers  (Semitrailer M270A1)

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Minor  adjustment  of  the  brake
rests on the cam.
(par.56c)  adjusts  the  cam  in  the  proper  position
to eliminate excessive movement when the brakes are
applied.
The
(eccentric)
anchor
pins
at
the
pivoted
ends
of
the brake shoes are used to relate the brake shoe
arc
to
the
contour
of
the
brake
drum.
They are
employed in the major brake adjustment (par.56c).
l.
Brake Hydraulic Master  Cylinders  and  Air  Chambers  (Semi-
The brake hydraulic master cylinders (fig.
trailer
M270A1).
17) are installed and secured with the brake air chambers in
brackets secured to chassis frame cross members. Compressed
air admitted. into the air chamber acts against a diaphragm to
which  a  push  rod  is  attached.  The  air  pressure  moves  the
diaphragm
and
attached
push
rod.
This
movement
causes
a
corresponding movement of a piston in the hydraulic master
cylinder.  Hydraulic  fluid  present  in  the  body  of  the  hydraulic
master
cylinder
thus
is
put
under
pressure
and
forced
into
the wheel brake cylinders for a brake application. A filler
cap assembly is provided at the top of the cylinder body for
use
when
filling
the
cylinder
with
hydraulic
fluid.
TAGO 1321B
29



   


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