CDL Air Brakes Endorsement Test (CDL-AB) Exam Blueprint

CDL-AB

25Questions
80/Percentage (80% passing for all CDL knowledge tests)Passing Score
Practice CDL Air Brakes Endorsement Test on QuizForge

Exam Domains

1 Air Brake System Components Weight not published
2 Dual Air Brake Systems Weight not published
3 Inspection and Testing Weight not published
4 Using Air Brakes Weight not published

Exam Details

Question TypesMultiple Choice
FormatLinear (computer-based at state DMV)
Online ProctoringNot available
ID RequirementsValid state-issued identification required. Must have a valid non-CDL driver's license to apply for a CDL learner's permit. DOT medical certificate (DOT physical) required for CDL issuance.
RenewalRequired -- CDL valid for 4–8 years depending on state. Renewal requires current DOT medical certificate. HazMat endorsement must be renewed every 5 years (TSA STA also renewed). Contact your state DMV for state-specific renewal requirements.
PrerequisitesRequired to remove the air brake restriction from CDL (recommended)
Retake PolicyTypical 14-day waiting period between failed attempts; exact policy varies by state. Some states impose additional fees for each retake attempt.

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