ON DZ license exam prep (2 of 5)
questions and answers graded A+
If trailer lines are cross connected, which of these may happen with the trailer brakes?
The spring brakes may not release
The service brakes will not function properly
The towing vehicle may lose air
Any/all of these - correct answer ✔✔Any/all of these
What do the foundation components consist of?
The brake assembly components
The axle and wheel components
The driver's control components
The engine components - correct answer ✔✔The brake assembly components
The trailer supply valve is usually operated from the dashboard by a control with a knob of
which colour?
Red
Yellow
Blue
Green - correct answer ✔✔Red
Which of these is not the type of foundation brake system?
'V' brakes
Disc brakes
, Wedge brakes
'S' Cam brakes - correct answer ✔✔'V' brakes
Trailer service brakes can be operated by...?
A hand valve
Neither of these
The brake pedal
Either of these - correct answer ✔✔Either of these
A caging bolt is used by a technician to do what?
Make the spring brakes smoother
Increase power in the spring brake chamber
Disable the spring brake chamber
Decrease power in the spring brake chamber - correct answer ✔✔Disable the spring brake
chamber
Which of these can cause the air pressure to drop and so activate the spring brakes?
A disconnected supply line
A ruptured supply line
Closing the trailer supply valve
Any of them - correct answer ✔✔Any of them
Trailer brake subsystems supply air...?
To the service and spring brakes equally
Either service brakes first or spring brakes first; depending on manufacturer
To the spring brakes first
questions and answers graded A+
If trailer lines are cross connected, which of these may happen with the trailer brakes?
The spring brakes may not release
The service brakes will not function properly
The towing vehicle may lose air
Any/all of these - correct answer ✔✔Any/all of these
What do the foundation components consist of?
The brake assembly components
The axle and wheel components
The driver's control components
The engine components - correct answer ✔✔The brake assembly components
The trailer supply valve is usually operated from the dashboard by a control with a knob of
which colour?
Red
Yellow
Blue
Green - correct answer ✔✔Red
Which of these is not the type of foundation brake system?
'V' brakes
Disc brakes
, Wedge brakes
'S' Cam brakes - correct answer ✔✔'V' brakes
Trailer service brakes can be operated by...?
A hand valve
Neither of these
The brake pedal
Either of these - correct answer ✔✔Either of these
A caging bolt is used by a technician to do what?
Make the spring brakes smoother
Increase power in the spring brake chamber
Disable the spring brake chamber
Decrease power in the spring brake chamber - correct answer ✔✔Disable the spring brake
chamber
Which of these can cause the air pressure to drop and so activate the spring brakes?
A disconnected supply line
A ruptured supply line
Closing the trailer supply valve
Any of them - correct answer ✔✔Any of them
Trailer brake subsystems supply air...?
To the service and spring brakes equally
Either service brakes first or spring brakes first; depending on manufacturer
To the spring brakes first
