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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 in the system, so the brakes will be applied instantly when you depress the brake pedal. With air brakes, the compressed air must flow through a complex series of lines, valves, etc., to reach and fill the brake chambers before the brakes can begin to slow your vehicle. This "brake lag" can take at least a half second.
B brakes use different brake drums.
C brakes require heavier return springs.