Last Updated：2025/12/30
Sentence
Some
vehicles
with
air
brakes
also
use
a
wigwag
low
pressure
indicator.
This
is
mounted
above
the
windshield.
If
the
air
pressure
drops
below
60
psi,
the
signal
arm
will
drop
down
across
the
windshield.
You
can't
reset
it
(push
it
back
out
of
view)
until
air
pressure
is
brought
above
60
psi.
Don't
operate
the
vehicle
with
the
signal
arm
lever
down.
Quizzes for review
Some vehicles with air brakes also use a wigwag low pressure indicator. This is mounted above the windshield. If the air pressure drops below 60 psi, the signal arm will drop down across the windshield. You can't reset it (push it back out of view) until air pressure is brought above 60 psi. Don't operate the vehicle with the signal arm lever down.
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