Answer :
Final answer:
During an emergency stop, both the tractor and trailer brakes will engage simultaneously, regardless of the trailer having ABS and the tractor not.
Explanation:
If the trailer has antilock brakes (ABS) but the tractor doesn't, when an emergency stop occurs, the correct response is C) both the tractor and trailer brakes will engage simultaneously. This is because ABS systems are designed to prevent the wheels from locking up during heavy braking, but they do not change the order in which the brakes are applied. When the brake pedal is applied, the braking system will engage the brakes on both the tractor and the trailer at the same time. The ABS will then modulate the braking pressure on the trailer wheels if they are at risk of locking, while the tractor's wheels may lock up if it's not equipped with ABS.
