310T- Air System and Brakes| Ques ons and answers |
Updated RATED A+
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 'me?
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.
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 applica'on?
a. Brakes adjusted to 'ght.
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 applica'on?
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 a3er 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 applica'on?
a. Worn cam bushings.
b. Worn drums and shoes.
c. Slack adjuster set too 'ght.
d. Excessive applica'on pressure.
b. Worn drums and shoes.
9. What will cause an engine braking system to operate only in the first and third stage?
a. Faulty dash switch.
b. Faulty brake switch.
c. Faulty clutch switch.
d. Faulty thro9le switch.
a. Faulty dash switch
10. What would be indicated if one engine brake head con'nues to operate a3er the brake
switch is turned off?
a. Faulty clutch switch.
b. Solenoid valve stuck closed.
c. Broken master piston spring.
d. Broken hydraulic control valve springs.
Updated RATED A+
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 'me?
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.
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 applica'on?
a. Brakes adjusted to 'ght.
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 applica'on?
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 a3er 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 applica'on?
a. Worn cam bushings.
b. Worn drums and shoes.
c. Slack adjuster set too 'ght.
d. Excessive applica'on pressure.
b. Worn drums and shoes.
9. What will cause an engine braking system to operate only in the first and third stage?
a. Faulty dash switch.
b. Faulty brake switch.
c. Faulty clutch switch.
d. Faulty thro9le switch.
a. Faulty dash switch
10. What would be indicated if one engine brake head con'nues to operate a3er the brake
switch is turned off?
a. Faulty clutch switch.
b. Solenoid valve stuck closed.
c. Broken master piston spring.
d. Broken hydraulic control valve springs.
