2024\2025 A+ Grade
Modulating valve
- correct answer Control handle on the dashboard that may be used to apply spring brakes gradually
Some vehicles have a separate air tank that can be used to release the
- correct answer Spring brake
You need at least what tread on the front tires and what thread on the rear tires
- correct answer 4/32inch in front
2/32inch in rear
Steering wheel play of what degree can make it hard to steer
- correct answer 10 degrees or two inches
If more than one-forth or more leaf springs are leaking
- correct answer It will put the vehicle out of service
What warning devices for parked vehicles
- correct answer Three reflective warning triangles, or 6 fuses or 3 liquid burning flares
What should the Pressure build in three minutes and when does the governor cutout
- correct answer Pressure should build from 50psi to 90 psi in 3minutes. Governor cut out at 120-140psi
Safety equipment
- correct answer Spare electrical fuses unless vehicle has circuit breakers, three red reflective triangles
or three red burning flares
Proper idle and operating Oil pressure
- correct answer 5-20 psi
, Operating 35-75psi
Testing for hydraulic leaks
- correct answer Pump the break pedal three times then apply firm pressure and hold for 5 seconds the
pedal should not move if it does something is wrong
When should drivers inspect trucks and cargo? B
- correct answer They must inspect the securement of cargo within the first 50 miles of a trip and every
150 miles or three hours whichever comes first
Road speed
- correct answer Mph
Engine speed
- correct answer Rpm
Retarders
- correct answer Help slow a vehicle
Four basic types of Retarders
- correct answer Exhaust,engine, hydraulic, and electric
When should you turn the retarder off?
- correct answer When your drive wheels have poor traction you should turn off it in icy snowy or wet
conditions.
How far should you look ahead
- correct answer About 12-15 seconds at lower speeds about a block at higher speeds about a quarter
mile
When should mirror adjustment take place
- correct answer Before the start of a trip when the trailers are straight