After stopping a partly filled tank vehicle on level pavement, why should you maintain steady brake pressure?
Correct answer: C. – Because liquid surge may push the vehicle forward or backward
The Virginia Commercial Driver’s Manual explains that liquid may continue surging back and forth after a tanker stops. When the moving wave reaches the end of the tank, it can push the vehicle in the wave’s direction. Maintain steady brake pressure and do not release the brakes too soon.
Source: Virginia Commercial Driver’s Manual — § 8.2.2, “Danger of Surge”; § 8.3.2, “Controlling Surge”, 49 CFR § 383.5 – Definitions

