Airstream 1980 Argosy Owner's Manual page 17

breakaway protection should the trailer break
away from the tow vehicle. Brakes engaged by
a disconnected supply line can be disengaged
by pushing and holding knob. (Fig. 5) on brake
release valve for 10 seconds. Blocking or
chocking wheels is necessary when parking
your trailer. Do not use trailer brakes as
parking brakes by disconnecting the trailer
vacuum line.
The self-adjusting disc brake calipers (Fig. 6)
should be inspected for wear any time the
wheels are removed for tire rotation, wheel
bearing maintenance, etc. The lining will need
replacement if there is evidence of brake fluid
leakage or if there is less than 1 /16" between
the liner and liner's steel backing plate. See
your Airstream dealer for all trailer braking
service.
Additional information on the Brake System is
available in the Service Manual.