Combinations
For your brakes to work properly, air supply must reach...?
From the tractor to the rear trailer
Air pressure for your brakes should build from 50 to 90 psi within what time?
Always try to back toward the driver's side because
You can see better watching the vehicle's rear out the side window.
As part of your safety equipment, your vehicle should have how many red reflective triangles?
Three
What is the first step of the pre-trip inspection?
Check overall condition of vehicle.
The service air line is usually colored...?
Blue
If your vehicle has hydraulic brakes, you should pump the brake pedal three times and then apply firm pressure for five seconds. The pedal should...?
Stay in place
The most important reason for inspecting your vehicle before traveling is...?
Side marker reflectors which are not at the rear of the vehicle must be what color?
Amber
The second step of a pre-trip inspection should be to check...?
The engine compartment
When connecting a tractor to a trailer, you should have your transmission in...?
Neutral
To check the stopping action of your service brakes, you should test them at about...?
5 mph
If a yellow light on the left rear of the trailer stays on when you switch the engine on, this means...?
The ABS is not working properly
What is the main problem which a broken exhaust system can cause?
It can poison the driver
Why should you look under your vehicle at the beginning of your pre-trip inspection?
For Leaks
The foot pedal on a tractor-trailer combination applies air to the service brakes...? (what wheels)
At all wheels
When checking your air brakes, it is essential that? (What is functional?)
Both emergency and service brakes are fully functional
All tires other than the front tires of a commercial vehicle must have a minimum tread depth of...?
2/32 of an inch
If your oil pressure is below the indicated limit, you should...?
Stop immediately
What paperwork should you check before beginning your pretrip inspection?
The last vehicle inspection report
If the fifth wheel plate is not greased as required on a tractor semitrailer combination, it could cause...?
Steering problems
The most common type of foundation brake found on heavy vehicles is the...?
S-cam drum
In city driving, you should be planning ahead for a distance of about...?
A vehicle must be placed out of service if what fraction of the leaves in any spring assembly on the suspension are broken?
1/4
After your first in trip inspection of the securement of your cargo, you must make regular additional inspections...?
Every 150 miles or three hours, whichever comes first