Practice question

What is 'air brake lag' and how does it affect stopping distance compared to hydraulic brakes?

It is the time it takes the air compressor to start up, adding 10 seconds to stops
It is the time required for compressed air to travel through the lines to the brake chambers after the pedal is pressed, adding roughly 0.4 second (and several metres) to stopping distance
It is a delay in the engine cooling fan, which has no effect on braking
It is the time it takes for the brake pads to cool down

Answer: B — It is the time required for compressed air to travel through the lines to the brake chambers after the pedal is pressed, adding roughly 0.4 second (and several metres) to stopping distance

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