Technician B says that
the rear toe angle
determines the thrust angle.
What determines thrust angle?
The thrust angle is an imaginary line drawn
perpendicular to the rear axle's centerline
. It compares the direction that the rear axle is aimed with the centerline of the vehicle. … Also, a thrust angle can be generated by rear toe settings that are independent of the axle angle or implied axle angle.
How do you set thrust angle?
First, the thrust angle could be
generated by the angle of the axle
or a misaligned rear suspension cradle that can change the toe angles. Also, a thrust angle can be generated by rear toe settings that are independent of the axle angle or implied axle angle.
Is thrust angle adjustable?
The thrust angle is the angle between where the rear are directed and the centerline of the vehicle. The
only way to adjust the thrust angle is through adjustable rear CAs
.
What causes incorrect thrust angle?
An incorrect thrust angle is often caused by
an out-of-position axle or incorrect toe settings
. So in addition to the handling quirks that are the result of incorrect toe settings, thrust angles can also cause the vehicle to handle differently when turning one direction vs. the other.
How do you check thrust angle alignment?
The thrust angle measures axle alignment by
comparing the angle of the rear axle with the centerline of your vehicle
. Looking at a car from above, you would draw the thrust line perpendicular to the rear axle. This identifies the direction in which the rear wheels want to roll.
Which alignment angle is least likely to wear tires?
Like caster, camber is measured in degrees of an angle. If the tire appears to tilt outward at the top, the camber angle is positive. If the top of the tire tilts inward, the camber angle is negative.
Zero camber-
a perfectly vertical wheel and tire-causes the least tire wear.
What causes positive thrust angle?
Positive thrust angle. … On a vehicle with an independent front suspension and a rear live-axle, the shifted rails will cause the front suspension to have an increased setback and thrust angle. This is caused by
the mounting points of the suspension moving
.
What is positive thrust angle?
The thrust angle is the difference between the geometric centerline and the thrust line, measured in increments of degrees.
If the thrust angle aims to the right
, this is called a positive thrust angle.
Why is thrust angle important?
Why is it important? For street vehicles,
the thrust angle must be aligned with the vehicle centerline
. This ensures the vehicle travels in a straight line and handles predictably. For solid axle vehicles, if the trust angle is off, it could mean the frame is bent.
Do I need a thrust alignment?
A thrust angle alignment is
recommended for vehicles that have independent rear suspensions
. If any of the wheels have incorrect toe, or if your vehicle handles differently when turning in one direction versus the other, then a thrust angle alignment will likely solve the problem.
What is included angle in alignment?
Included angle is
the angle formed between the SAI and the camber
. Included angle is not directly measurable. To determine the included angle, you add the SAI to the camber. If the camber is negative, then the included angle will be less than the SAI, if the camber is positive, it will be greater.
Can you align solid rear axle?
Solid rear axle vehicles
normally have no provisions for alignment adjustment
. The alignment angles on all four wheels are read by the alignment equipment but only the front axle is adjusted. … This is better than a two wheel alignment but there can still be issues with pulling and steering wheel position.
How much does a thrust alignment cost?
A thrust-angle alignment can cost
between $49 and $79
, and a four-wheel alignment from $89 up. It takes a lot to knock your car out of alignment; your average run-of-the-mill pothole won't do it.
Do you adjust caster or camber first?
With front-end alignments,
correct caster and camber adjustments first
. Certain FWD vehicles do not offer caster adjustments, but correcting the camber may bring the caster within specs.
