The ASE H4 brakes test will test your knowledge of the air supply and service systems, mechanical brakes, parking brakes and more. This is a practice test based on the official study guide. Find a mechanic school near you.
#1. A transit bus, with a ruptured air supply tank, is being towed from the front. The technician should:
cage the rear air brake chambers is correct
#2. Brake shoe-to-drum clearance, on a transit bus with S-cam brakes, is maintained by adjusting the:
slack adjuster is correct
#3. The parking brakes fail to apply on a transit bus with air brakes. Technician A says that low air pressure in the spring brake chamber could be the cause. Technician B says that a ruptured spring brake diaphragm could be the cause. Who is right?
Neither A nor B is correct
#4. The air line from the air drier to the air supply (wet) tank is being replaced. Technician A says that there should be no low spots in the line after installation. Technician B says that a smaller diameter line may be used for the replacement. Who is right?
A only is correct
#5. A transit bus’ parking brake valve button pops out immediately after being depressed. Technician A says that this could be caused by low system air pressure. Technician B says that this could be caused by air in the emergency chamber. Who is right?
A only is correct
#6. A transit bus has an uneven braking problem. Which of these could be the cause?
A bad brake drum is correct
#7. An air compressor is not unloading, causing the air tank safety valve to pop off. This could be caused by any of these EXCEPT:
an obstructed intake is correct
This is not an official test it is a practice test based on the official study guide. Use it for entertainment purposes only.