Practice question

For the Kentucky CDL Combination Vehicles test, which statement is correct about tractor protection pressure?

  1. Close every shut-off valve before moving the combination.
  2. The tractor protection valve usually closes in the 20 to 45 psi range.
  3. Use actual loaded weight instead of GVWR or GCWR for CDL class decisions.
  4. Use the trailer hand valve for normal braking while driving.

Answer: B — The tractor protection valve usually closes in the 20 to 45 psi range.

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