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Question:

Air braking takes more time than hydraulic braking because air _____________.

A takes more time to flow through the lines than hydraulic fluid.
Explaination

With hydraulic brakes, hydraulic fluid is always present in the system, so when you push the brake pedal, the brakes are applied instantaneously. Before air brakes can begin to slow your vehicle, pressurized air must travel through a complicated network of lines, valves, and other components to reach and fill the brake chambers. This "brake lag" can last up to half a second.