Question

Most heavy-duty vehicles nowadays have a dual air brake system. What is a dual air brake system?

Accepted Answer

two separate air brake systems that use a single set of brake controls

Answer

a "primary" air brake system for everyday use and a "secondary" air brake system only for emergencies

Answer

two air brake systems with separate sets of controls

Answer

two air brake systems that share the same set of air tanks

Question 31 - Air Brakes Test Practice Test for the CDL