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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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