Volvo VNL 780 Operator's Manual page 122

112 INSTRUMENTS AND CONTROLS
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O = Off
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A = Engine Brake Cruise Control ? In this position when Cruise Control is enabled and
vehicle speed exceeds the set cruise speed, the I-VEB will engage with infinite control
(within the limits of the engine brake) to maintain that speed
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1 = 40% Engine Braking
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2 = 70% Engine Braking
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3 = 100% Engine Braking
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B = I-Shift Brake Program — When ordered in conjunction with the Volvo I-Shift
Transmission, the controls are integrated