Volvo 780 Owner's Manual page 60

1989 Volvo 780
during the stop.
The force must not lock the rear wheels. If this happens, release the brake enough to let the wheels
rotate. Drive a mile between each stop to cool the brakes. Check for proper parking brake operation.
WARNING!
The brake lights are not illuminated when applying the parking brake. To warn traffic from behind it
is therefore advisable to depress the brake pedal slightly to illuminate the brake lights.
pg. 56 Trailer hauling
When preparing for trailer hauling, observe the following:
Use a trailer hitch which meets Federal Safety Standards for rear end collisions (FMVSS 301-75).
An automatic transmission oil cooler must also be installed, since the automatic transmission is subject
to increased load and temperature, certain vehicles are equipped with this extra oil cooler as standard
equipment. Consult your Volvo dealer for further information.
Maximum trailer weight recommended by Volvo is 1,985 lbs (908 kgs). Observe legal requirements
of the state in which the vehicles are registered.
All Volvo models are equipped with energy-absorbing shock-mounted bumpers. Trailer hitch
installation should not interfere with the proper operation of this bumper system.
WARNING!
Bumper-attached trailer hitches must not be used on Volvos, nor should safety chains be attached to
the bumper. Trailer hitches attaching to the vehicle rear axle must also not be used.
WARNING!
Never connect a trailer's hydraulic brake system directly to the vehicle brake system, nor a trailer's
lighting system directly to the vehicle lighting system. Consult your nearest authorized Volvo dealer
for correct installation.
Trailer towing does not normally present any particular problems, but take into consideration:
Increase tire pressure to recommended full load pressure. See section "wheels and tires".
Recommended hitch tongue load is 110 lbs (50 kgs).
Engine and transmission are subject to increased loads. Therefore, engine coolant temperature should
be closely watched when driving in hot climates or hilly terrain. Use lower gear and turn off air
conditioner if temperature gauge pointer enters the red range.
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