QLD Heavy Vehicle Knowledge Test Practice Questions - Queensland Class LR MR HR HC MC Heavy Vehicle Road Rules Knowledge Test Exam

What is the typical lag time characteristic of heavy vehicle air brake systems?

Brakes apply instantly with no delay A short delay between pressing the brake pedal and full brake application at all axles as air pressure travels through the system Air brakes only work above 60 km/h Lag time means brakes never need maintenance

Correct Answer:

A short delay between pressing the brake pedal and full brake application at all axles as air pressure travels through the system

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