CDL Air Brakes Endorsement/Topics/Stopping Distance

Stopping Distance practice test: free CDL Air Brakes Endorsement questions

Stopping Distance covers 12 questions in the QuizCram bank (12% of all questions), ranking as the sixth biggest domain for the CDL air brakes endorsement exam. Questions are written against the official Original practice questions on the air brakes endorsement, written from the federal knowledge requirements in 49 CFR Part 383 and the public CDL manual facts. The real test is a multiple-choice knowledge test, and you need 80% to pass. Try the 2 free sample questions below to test your understanding of these core rules.

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12 questions, the sixth biggest topic. The ring is its size next to the biggest.

Try the Stopping Distance questions

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  1. Stopping distance1 of 2

    Total stopping distance for an air brake vehicle is made up of which four parts?

    The answer

    Answer: D. The four components add together: perception distance, reaction distance, brake lag distance and braking distance. Air brakes add the lag term because pressure must travel through the lines before the brakes apply. The wrong lists mix in terms the manual does not use, such as steering distance, unloading distance, engine drag and air loss.

    Source: 5.4.4 - Stopping Distance

  2. Stopping distance2 of 2

    About how much distance does air brake lag add at 55 mph on dry pavement?

    The answer

    Answer: A. Air must flow through the lines after the pedal moves, so the brakes engage later than hydraulic brakes would. At 55 mph that lag accounts for roughly 32 extra feet before braking distance even begins. Twelve feet is too short for the delay you would feel, and the larger figures of 52 or 72 feet overstate it.

    Source: 5.4.4 - Stopping Distance

Quick answers on Stopping Distance

QuizCram covers 12 practice questions in the Stopping Distance domain, mapped directly to the official examination blueprint.

The benchmark score is 80% (Multiple-choice knowledge test · 80% to pass (49 CFR 383.135) · item count set by your state).

Yes. All questions on QuizCram are written against official handbooks and blueprint specifications with legal citations.