AB Quiz

When using the brake pedal, what system applies and releases the brakes?

• Hydraulic brake system

• Parking brake system

• Service brake system

What does the governor on the air compressor control?

• Purified air going to the air tanks.

• When air needs to be pumped air in the air storage tanks.

• The routing of air back to the compressor.

On the supply pressure gauge, at what PSI should the air compressor shut off?

• 90

• 150

• 125

At what PSI does the air compressor kick on?

• 60 lbs. PSI

• 100 lbs. PSI

• 90 lbs. PSI

What could happen if the alcohol evaporator is not full during winter driving?

• The defroster will work better

• Ice will build up on the windshield.

• Ice will build up in air lines, air tanks, and valves causing brake failure.

What is the required maximum PSI in the air tanks for the safety valve to work properly?

• 200 PSI

• 150 PSI

• 120 PSI

What does the brake pedal control with an air brake system?

• The parking brake.

• Air flowing into the tanks.

• The air pressure applied to the brakes.

What will excessive use of the brake pedal cause?

• Cooling down the brakes.

• Loss of air pressure in the tanks.

• Nothing, there is plenty of air in the air tanks.

The most common foundation brakes on heavy vehicles are?

• Disc brakes.

• Hydraulic brakes.

• S-cam brakes.

When pressing down on the brake pedal, the brake shoes or linings are pressed up against the inside of the, what?

• Spring brake

• Hydraulic brake.

• Brake drum.