How should a driver brake a combination vehicle equipped with ABS, compared to one without it?

AAMVA CDL Manual, Section 6.3.2, p. 6-7

Drivers moving between older and newer equipment need one consistent braking habit rather than switching techniques based on which unit has ABS. Applying old pump-the-brakes habits on an ABS-equipped rig, or vice versa, can reduce control exactly when it matters most.