Section 05.02 Dual AB Quiz

What is the primary purpose of a dual air brake system in heavy-duty vehicles?

• To provide better fuel efficiency

• To ensure safety by having two separate air brake systems

• To increase the speed of the vehicle

• To reduce the weight of the vehicle

What should the minimum air pressure be in both the primary and secondary systems before driving a vehicle with a dual air system?

• 50 psi

• 55 psi

• 100 psi

• 150 psi

What should you do if the air pressure drops below 55 psi in either system while driving?

• Continue driving at a slower speed

• Stop right away and safely park the vehicle

• Increase the speed to build up pressure

• Ignore the warning and keep driving

What is the function of the warning light and buzzer in a dual air brake system?

• To indicate when the vehicle needs refueling

• To alert the driver when air pressure is low

• To signal when the vehicle is speeding

• To notify the driver of engine overheating

What should you check during Step 2 Engine Compartment Checks for air brake systems?

• Air Compressor Drive Belt

• Slack Adjusters

• Brake Drums

• Air Leakage Rate

What is the most common problem found in roadside inspections related to air brakes?

• Loose brake drums

• Out-of-adjustment brakes

• Worn brake linings

• Cracked brake hoses

What should you do if a slack adjuster moves more than about one inch where the push rod attaches to it?

• Replace the brake drum

• Adjust it or have it adjusted

• Check the air compressor

• Check the air leakage rate

What should be checked to ensure brake drums are safe?

• They must not have cracks longer than half the width of the friction area

• They must be soaked with oil or grease

• They must be loose

• They must be missing

What should the air governor cut-out the air compressor at?

• About 100 psi

• About 125 psi

• About 150 psi

• About 175 psi

What is the acceptable air leakage rate for single vehicles?

• Less than 1 psi per minute

• Less than 2 psi per minute

• Less than 3 psi per minute

• Less than 4 psi per minute