CDL - COMBINATION VEHICLES
To prevent rollovers - Answer- Keep load close to ground as possible
Drive slowly around corners
Tailers may rollover without tractor rolling over
How to prevent trailer skid - Answer- 1. Recognize trailer skid early with mirrors
2. Stop braking
3. If must enter another lane to turn, turn wide as you complete the turn.
When backing, how to correct trailer drift? - Answer- Turn the steering wheel in the
direction of the drift
When do you use trailer hand brake? - Answer- ONLYfor tersting trailer brakes
Should trailer hand brake be used for parking? - Answer- No B/c trailer brakes are
airbrakes--air leaks out and will eventually lead to unlocking of brakes
Glad Hands - Answer- Hose couplers that connect service and emergency air lines
What effect do ABS have on overall braking capability - Answer- ABS is addition to
normal brakes and do not increase or decrease braking capability
Once trailer coupled with tractor... - Answer- *raise landing gear, starting in LOW gear
range, and switching to HIGHgear range once free of weight
*Secure crank handle safely
When coupling tractor and trailer, how much space between 5th wheels? - Answer-
NOspace b/t lower and upper 5th wheels
When backing tractor under trailer, which gear should be used? - Answer- Lowest
reverse gear
Why back tractor directtly to trailer rather than at angle? - Answer- Might buckle landing
gear and damage/collapse trailer ground supports.
Max lengths - Answer- Single vehicle or trailer in combo is 53'
Doubles: 61' trailer combined length
Buses: 40ft
Max trailer width - Answer- 102"
Max height - Answer- 14'
How soon should emergency stuff be placed outside truck if pulled over on road? -
Answer- 10 min
To prevent rollovers - Answer- Keep load close to ground as possible
Drive slowly around corners
Tailers may rollover without tractor rolling over
How to prevent trailer skid - Answer- 1. Recognize trailer skid early with mirrors
2. Stop braking
3. If must enter another lane to turn, turn wide as you complete the turn.
When backing, how to correct trailer drift? - Answer- Turn the steering wheel in the
direction of the drift
When do you use trailer hand brake? - Answer- ONLYfor tersting trailer brakes
Should trailer hand brake be used for parking? - Answer- No B/c trailer brakes are
airbrakes--air leaks out and will eventually lead to unlocking of brakes
Glad Hands - Answer- Hose couplers that connect service and emergency air lines
What effect do ABS have on overall braking capability - Answer- ABS is addition to
normal brakes and do not increase or decrease braking capability
Once trailer coupled with tractor... - Answer- *raise landing gear, starting in LOW gear
range, and switching to HIGHgear range once free of weight
*Secure crank handle safely
When coupling tractor and trailer, how much space between 5th wheels? - Answer-
NOspace b/t lower and upper 5th wheels
When backing tractor under trailer, which gear should be used? - Answer- Lowest
reverse gear
Why back tractor directtly to trailer rather than at angle? - Answer- Might buckle landing
gear and damage/collapse trailer ground supports.
Max lengths - Answer- Single vehicle or trailer in combo is 53'
Doubles: 61' trailer combined length
Buses: 40ft
Max trailer width - Answer- 102"
Max height - Answer- 14'
How soon should emergency stuff be placed outside truck if pulled over on road? -
Answer- 10 min
