answered correctly latest update 2025
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
What are curved mirrors called --- correct answer ---Fisheye, spot,
bugeye