CCDL Permit Prep
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Lesson 01 · 4 min

Build the stopping path

Explain perception, reaction, braking, and the added lag in air-brake systems.

01
Rule to rememberCount perception, reaction, and braking distance. With air brakes, also count brake-lag distance.

See

Perception distance is how far the vehicle travels while you see and understand a hazard.

Act

Reaction distance is how far the vehicle travels while you move your foot to the brake.

Stop

Brake lag adds travel after the pedal is pressed and before air brakes act. Braking distance follows. Speed, traction, brake condition, and load affect the result; an empty truck is not guaranteed to stop sooner.

Sources