Ford 2013 F-650 Owner's Manual page 154

Exhaust Brake Operating Characteristics
When you remove your feet from both the accelerator and clutch pedals
and the exhaust brake switch is in the on position, the exhaust brake is
activated. The following conditions exist if the brake is operating properly:
• A slight change in engine sound when the exhaust brake is activated.
• A smooth braking effect. Do not expect a retarding effect similar to
sudden, hard application of the service brakes.
• The retarding force possibly felt acting against your body when the
brake is applied (depending on the grade and vehicle load). This force
is actually preventing the vehicle from going much faster.
• Engine temperature remaining in the normal operating range.
• The tachometer showing a drop in engine RPM (depending on grade
and vehicle load) during a descent.
• A decrease in road speed when the exhaust brake is applied during a
descent, except when the vehicle is carrying a heavy load or the grade
is extremely steep. In these instances, you may need to apply the
service brakes occasionally.
TRAILER BRAKES
Trailer Brake Hand Control (If Equipped)
WARNING: The hand control should never be used to apply
the brakes when the tractor and trailer are parked unattended.
Air may leak from the system and the vehicle could possibly move,
resulting in possible property damage, personal injury or death.
It operates a valve that provides gradual control of air pressure applied.
When the valve is only partially applied, the trailer brakes can be
overridden by pressing fully on the brake pedal.
To apply the trailer brakes using the hand control, move the lever
downward. The further the lever is pushed down, the greater the air
pressure is applied to the brakes. The lever remains in place until
manually moved.
To release the trailer brakes, move the lever up completely.
2013 F-650/750 (f67)
Owners Guide gf, 2nd Printing, March 2013
USA (fus)
Brakes
The hand control is located on the
right-hand side of the instrument
panel. It is used to apply the
trailer service brakes which are
independent of the truck or tractor
service brakes.
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