A dual air brake system has:
a.Two complete sets of brake drums
b.Two separate air brake systems with a single set of controls
c.Two brake pedals for redundancy
d.Two air compressors
Explanation
A dual air brake system has two separate air brake systems that use a single set of brake controls. The primary system typically operates the rear axle brakes, and the secondary system operates the front axle brakes, providing redundancy.