Antilock Braking Systems (ABS) Practice Test

Wrong. This reverses the actual order, truck tractors were covered first, starting March 1, 1997, not other vehicle types.

The correct answer is A: March 1, 1997 for truck tractors; March 1, 1998 for other air-brake vehicles.

49 CFR 393.55(c)(1)-(2) (ABS mandatory equipment dates: truck tractors on or after March 1, 1997; other air-braked CMVs on or after March 1, 1998)

Wrong. The manual sets two separate dates by vehicle type rather than one blanket date, and March 1, 1997 applied only to truck tractors, not every air-brake vehicle.

The correct answer is A: March 1, 1997 for truck tractors; March 1, 1998 for other air-brake vehicles.

49 CFR 393.55(c)(1)-(2) (ABS mandatory equipment dates: truck tractors on or after March 1, 1997; other air-braked CMVs on or after March 1, 1998)

Wrong. ABS was not federally mandated until the late 1990s (1997/1998); many vehicles built before these dates were never required to have it, though some were voluntarily equipped.

The correct answer is A: March 1, 1997 for truck tractors; March 1, 1998 for other air-brake vehicles.

49 CFR 393.55(c)(1)-(2) (ABS mandatory equipment dates: truck tractors on or after March 1, 1997; other air-braked CMVs on or after March 1, 1998)