During normal driving, parking brakes are held back by:

Air pressure.. Section 5.1: Parking brakes (spring brakes) are held back (released) by air pressure. If air pressure is removed, the

During normal driving, parking brakes are held back by:

ANSWER BREAKDOWN
  • A. Incorrect. "Springs." is not correct. Parking brakes (spring brakes) are held back (released) by air pressure. If air pressure is removed, the springs push the brakes on.
  • B. Correct. Parking brakes (spring brakes) are held back (released) by air pressure. If air pressure is removed, the springs push the brakes on.
  • C. Incorrect. "Centrifugal force." is not correct. Parking brakes (spring brakes) are held back (released) by air pressure. If air pressure is removed, the springs push the brakes on.
  • D. Incorrect. "Bolts." is not correct. Parking brakes (spring brakes) are held back (released) by air pressure. If air pressure is removed, the springs push the brakes on.