Thrust line is adjusted by changing which alignment angle?

The thrust line in a vehicle's suspension system is primarily influenced by the rear toe angle. The thrust line is an imaginary line that runs parallel to the rear axle and indicates the direction in which the vehicle is actually moving. If the rear wheels are not parallel to each other, or if there is an adjustment to the rear toe, this can cause the thrust line to deviate from its intended direction.

When the rear toe is adjusted, it changes the alignment of the rear wheels, which directly affects the position of the thrust line. By properly aligning the rear toe, technicians can ensure that the rear wheels are set parallel to each other, which helps maintain the vehicle’s tracking and steering accuracy. This is crucial for ensuring that the vehicle drives straight without undue steering correction from the driver.

Other alignment angles, such as front camber or front toe, influence how the front wheels interact with the road and tire wear, but they do not have the same direct impact on the thrust line as rear toe adjustments. Thus, adjusting the rear toe is vital for correcting the thrust line, making it the correct choice for this question.