The 'parking brake' applies the brakes on:

The rear wheels.. Section 5.1: Parking brakes usually apply the rear brakes (spring brakes).

The 'parking brake' applies the brakes on:

ANSWER BREAKDOWN
  • A. Incorrect. "The front wheels." is not correct. Parking brakes usually apply the rear brakes (spring brakes).
  • B. Correct. Parking brakes usually apply the rear brakes (spring brakes).
  • C. Incorrect. "All wheels." is not correct. Parking brakes usually apply the rear brakes (spring brakes).
  • D. Incorrect. "The trailer only." is not correct. Parking brakes usually apply the rear brakes (spring brakes).