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When the brake pedal is pushed down, air brakes work

A After a short delay
Explaination
Because air takes time to flow through the air lines to the brakes, air brakes cannot begin working instantly. There is often a brake lag of at least one-half of a second between the moment the brake pedal is pressed and the moment the brakes begin to work.
B Immediately
C After about a minute
D Only if it is warm outside