2
310T- Air System and Brakes Exam questions with accurate
|| || || || || || || || ||
answers
1. What will cause air to leak out of the relay valve with the park brake released and the
|| || || || || || || || || || || || || || || || || ||
service brake not applied?
|| || ||
a. Ruptured service brake diaphragm.
|| || || ||
b. Ruptured Park/Emergency brake diaphragm.
|| || || ||
c. Faulty secondary reservoir blow-off valve.
|| || || || ||
d. Parking/Emergency brake chamber pushrod seal leak. - ✔✔d. Parking/Emergency brake
|| || || || || || || || || || ||
chamber pushrod seal leak. || || ||
2. What will cause the wet tank air pressure to leak down overnight?
|| || || || || || || || || || || ||
a. A faulty air governor valve.
|| || || || ||
b. A faulty one way check valve.
|| || || || || ||
c. A faulty service brake diaphragm.
|| || || || ||
d. A leak in the air compressor outlet line. - ✔✔b. A faulty one way check valve.
|| || || || || || || || || || || || || || || ||
3. What is indicated by excessive air reservoir build up time?
|| || || || || || || || || ||
a. A plugged air drier.
|| || || ||
b. Air governor set too low.
|| || || || ||
c. A leaking service relay valve.
|| || || || ||
d. A restricted compressor air inlet. - ✔✔d. A restricted compressor air inlet.
|| || || || || || || || || || || ||
4. What will cause engine coolant to be present in the air system tanks?
|| || || || || || || || || || || || ||
a. Cracked intercooler.
|| ||
, 2
b. Leaking engine head gasket.
|| || || ||
c. Plugged air drier desiccant.
|| || || ||
d. Air compressor head gasket. - ✔✔d. Air compressor head gasket.
|| || || || || || || || || ||
5. What will cause excessive air pressure drop during a brake application?
|| || || || || || || || || || ||
a. Brakes adjusted to tight.
|| || || ||
b. Excessive pushrod travel.
|| || ||
c. Air governor cut out set too low.
|| || || || || || ||
d. Service tank relief valve leaking. - ✔✔b. Excessive pushrod travel.
|| || || || || || || || || ||
6. What would cause hydraulic drum brakes to "fade" during application?
|| || || || || || || || || ||
a. Low fluid level.
|| || ||
b. Excessive temperature.
|| ||
c. Leaking residual check valves.
|| || || ||
d. Weak brake shoe return springs. - ✔✔b. Excessive temperature.
|| || || || || || || || ||
7. What would be indicated if the ABS dash light goes out after 6 km/h?
|| || || || || || || || || || || || || ||
a. A faulty ECU.
|| || ||
b. A faulty wheel speed sensor.
|| || || || ||
c. No systems faults are present.
|| || || || ||
d. Faulty brake modulator valve. - ✔✔c. No systems faults are present.
|| || || || || || || || || || ||
8. What will cause an air brake to "cam over" during application?
|| || || || || || || || || || ||
a. Worn cam bushings.
|| || ||
b. Worn drums and shoes.
|| || || ||
c. Slack adjuster set too tight.
|| || || || ||
310T- Air System and Brakes Exam questions with accurate
|| || || || || || || || ||
answers
1. What will cause air to leak out of the relay valve with the park brake released and the
|| || || || || || || || || || || || || || || || || ||
service brake not applied?
|| || ||
a. Ruptured service brake diaphragm.
|| || || ||
b. Ruptured Park/Emergency brake diaphragm.
|| || || ||
c. Faulty secondary reservoir blow-off valve.
|| || || || ||
d. Parking/Emergency brake chamber pushrod seal leak. - ✔✔d. Parking/Emergency brake
|| || || || || || || || || || ||
chamber pushrod seal leak. || || ||
2. What will cause the wet tank air pressure to leak down overnight?
|| || || || || || || || || || || ||
a. A faulty air governor valve.
|| || || || ||
b. A faulty one way check valve.
|| || || || || ||
c. A faulty service brake diaphragm.
|| || || || ||
d. A leak in the air compressor outlet line. - ✔✔b. A faulty one way check valve.
|| || || || || || || || || || || || || || || ||
3. What is indicated by excessive air reservoir build up time?
|| || || || || || || || || ||
a. A plugged air drier.
|| || || ||
b. Air governor set too low.
|| || || || ||
c. A leaking service relay valve.
|| || || || ||
d. A restricted compressor air inlet. - ✔✔d. A restricted compressor air inlet.
|| || || || || || || || || || || ||
4. What will cause engine coolant to be present in the air system tanks?
|| || || || || || || || || || || || ||
a. Cracked intercooler.
|| ||
, 2
b. Leaking engine head gasket.
|| || || ||
c. Plugged air drier desiccant.
|| || || ||
d. Air compressor head gasket. - ✔✔d. Air compressor head gasket.
|| || || || || || || || || ||
5. What will cause excessive air pressure drop during a brake application?
|| || || || || || || || || || ||
a. Brakes adjusted to tight.
|| || || ||
b. Excessive pushrod travel.
|| || ||
c. Air governor cut out set too low.
|| || || || || || ||
d. Service tank relief valve leaking. - ✔✔b. Excessive pushrod travel.
|| || || || || || || || || ||
6. What would cause hydraulic drum brakes to "fade" during application?
|| || || || || || || || || ||
a. Low fluid level.
|| || ||
b. Excessive temperature.
|| ||
c. Leaking residual check valves.
|| || || ||
d. Weak brake shoe return springs. - ✔✔b. Excessive temperature.
|| || || || || || || || ||
7. What would be indicated if the ABS dash light goes out after 6 km/h?
|| || || || || || || || || || || || || ||
a. A faulty ECU.
|| || ||
b. A faulty wheel speed sensor.
|| || || || ||
c. No systems faults are present.
|| || || || ||
d. Faulty brake modulator valve. - ✔✔c. No systems faults are present.
|| || || || || || || || || || ||
8. What will cause an air brake to "cam over" during application?
|| || || || || || || || || || ||
a. Worn cam bushings.
|| || ||
b. Worn drums and shoes.
|| || || ||
c. Slack adjuster set too tight.
|| || || || ||
