When comparing total stopping distance components between commercial vehicles equipped with air brakes and those with hydraulic brakes, which statement accurately describes the key difference?
- AAir brake systems require an extended driver perception interval because the driver must monitor dashboard air pressure gauges before reacting.
- Air brake systems include an added brake lag distance because compressed air takes approximately one-half second to travel through the lines and actuate the brakes.Answer
- CAir brake systems eliminate driver reaction distance by automatically initiating friction braking the moment a hazard enters the forward path.
- DAir brake systems replace physical braking distance with the standard one-second-per-ten-feet following distance calculation.
Answer
Air brake systems include an added brake lag distance because compressed air takes approximately one-half second to travel through the lines and actuate the brakes.
Vehicles equipped with air brakes require an additional component known as brake lag distance. Because air takes roughly one-half second to flow through pneumatic lines and actuate the brake chambers, total stopping distance for air brakes includes perception distance, reaction distance, brake lag distance, and braking distance.
Step-by-Step Solution
Key Concept
Air brake stopping distance consists of four distinct components (Perception Distance, Reaction Distance, Brake Lag Distance, and Braking Distance), whereas hydraulic brake systems consist of three components because they lack significant brake lag.
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