Volvo VNL 780 Operator's Manual page 111

29. Trailer Hand Brake Control
The trailer hand brake control engages the trailer brakes. For information about the trailer
hand brake control, refer to "Trailer Brake Hand Control" page 320.
30. Passenger Window Control Switch or Optional Switch
The trailer hand brake control engages the trailer brakes. For information about the trailer
hand brake control, refer to "Trailer Brake Hand Control" page 320.
31. Water-In-Fuel (Purge Switch) (Optional)
The water-in-fuel drain switch is a non-locking switch used to drain the fuel water separator
on Volvo engines.
W3005378
Water-In-Fuel Drain Switch
A symbol displayed in the instrument panel indicates when it is recommended to drain
the water separator.
W3005378
Water-In-Fuel Symbol
Stop at the first opportunity and drain the water separator. If the warning symbol frequently
recommends that the water separator be drained, then there is a problem with the fuel quality.
Drain the fuel tank and refill with fuel of the correct quality.
INSTRUMENTS AND CONTROLS 101