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system in the event of locked brakes.
h. Chock Blocks.
Chock
blocks
are
provided
to
be placed in back of, or in front of, the semitrailer Wheels as
required
to
hold
the
vehicle
stationary
when
parked  on  an
The  chock
incline or when it is to be coupled or uncoupled.
blocks are made of triangular layers of wood (laminae) bolted
The chock blocks are chained to the chassis frame
together.
beams to prevent loss and chains and blocks are carried in
brackets when not in use.
i. Types of Brakes.
The brakes are of the air-over-
Semitrailer  M270A1.
(1)
hydraulic  type.  Two  brake  hydraulic  master  cylinders,
with
air
chambers
attached,
provide
the
means
for
converting the energy of compressed air into hydraulic
pressure
necessary
to
operate
the
hydraulically
actu-
ated semitrailer wheel brakes.
( 2 ) Semitrailers  M270  and  M269. The  brakes  are  of  the
air-actuated type. Air pressure is used to operate the
mechanical brake mechanisms at the semitrailer wheels,
applying the brakes with pressure in proportion to the
TAGO 1321B
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