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Most heavy-duty vehicles use:
A.  Single air brake systems.
B.  Dual air brake systems.
C.  Triple air brake systems.
D.  Quadruple air brake systems.
Most heavy-duty vehicles use dual air brake systems, in which there are two separate braking systems operated by a single set of controls. Each system operates the brakes on different axles.
Answer Statistics
8.21 % of our users get this question wrong.
This question's difficulty is Medium

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