Ase A4 Suspension & Steering
Certification Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. A technician is inspecting a vehicle with a rack and pinion steering system
and notices fluid leaking from the right-side bellows boot. Which of the
following is the most likely cause? A. A failed outer tie-rod end seal B. A
ruptured internal piston seal C. A faulty rack gear shaft seal D. An overfilled
power steering reservoir Rationale: The bellows boots on a rack and pinion
steering gear are designed to keep dust and debris out of the inner tie-rod
pivots, not to retain high-pressure fluid. If a bellows boot is filled with
fluid, it indicates that the internal end seal of the rack housing has failed,
allowing power steering fluid to bypass the shaft and accumulate in the
boot. Failed tie-rod ends do not contain power steering fluid, a piston seal
failure would cause a loss of assist but not an external leak, and an
overfilled reservoir would vent from the reservoir cap rather than the rack
bellows.
2. During a pre-alignment inspection, a technician finds that the vehicle's front
ride height is significantly lower than manufacturer specifications on the left
side. What is the most appropriate next step? A. Adjust the front camber to
compensate for the sag B. Inspect and replace the sagging front coil spring
before aligning C. Perform the wheel alignment and adjust toe-in D. Shim
the left front strut assembly to restore original height Rationale: Ride
height is a critical baseline measurement that must be verified before
performing a wheel alignment because changes in ride height directly
alter suspension geometry, including camber and toe. A sagging coil
, spring alters the control arm angles, throwing the alignment out of
specification permanently until the structural defect is remedied.
Attempting to align a vehicle with incorrect ride height or using shims on a
non-adjustable strut assembly will result in incorrect dynamic alignment
angles and rapid tire wear.
3. A vehicle pulls hard to the right during braking, but tracks straight when
coasting. Technician A says a seized left front brake caliper could cause this
symptom. Technician B says a worn compliance bushing on the right lower
control arm could be the cause. Who is correct? A. Technician A only B.
Technician B only C. Both Technician A and Technician B D. Neither
Technician A nor Technician B Rationale: Technician A is correct because if
the left caliper is seized and fails to apply braking force, only the right
front brake will decelerate the vehicle, pulling it to the right. Technician B
is correct because a worn compliance bushing allows the control arm to
shift rearward or forward under load; when braking, the force causes the
wheel with the worn bushing to shift rearward, changing the steering
geometry (specifically caster or toe) on that side, which induces a severe
dynamic pull during deceleration.
4. A vehicle exhibits a loud growling noise that increases in intensity with
vehicle speed. The noise becomes significantly louder when the vehicle is
steered to the left, and diminishes when steered to the right. Which
component is most likely defective? A. Right front wheel bearing B. Left
front wheel bearing C. Right outer CV joint D. Power steering pump bearing
Rationale: When a vehicle is steered to the left, the body weight and
centrifugal forces shift to the right side of the vehicle, heavily loading the
right-side wheel bearings. An increase in growling noise when turning left
indicates that the bearing receiving the extra load—the right front wheel
bearing—is damaged or pitted. Conversely, steering to the right unloads
the right bearing, causing the noise to decrease. CV joints typically click
during tight turns rather than growl continuously with vehicle speed.
,5. Which alignment angle is primarily responsible for directional stability and
the steering wheel's self-centering action after a turn? A. Negative Camber
B. Positive Toe C. Positive Caster D. Included Angle Rationale: Positive
caster projects the steering axis forward of the tire's contact patch, which
creates a trailing effect similar to a shopping cart caster wheel. This
geometric layout forces the wheels to travel in a straight line and provides
the mechanical self-centering force that pulls the steering wheel back to
center when exiting a turn. Camber affects tire wear and side-pull, while
toe is adjusted to prevent scrub and stabilize tracking, but neither
provides the primary self-centering directional stability that caster does.
6. While inspecting a conventional steering linkage system, the technician
notes that the steering wheel can be moved several degrees before the
front wheels respond. Which of the following is the least likely cause of this
excessive play? A. Excessive backlash in the steering gear box B. A worn
idler arm bushing C. A loose pitman arm on the steering shaft D. A binding
outer tie-rod end Rationale: Excessive play or looseness in the steering
wheel indicates wear or gaps between components, such as excessive gear
backlash, a worn idler arm, or a loose pitman arm attachment. A binding
outer tie-rod end increases friction and stiffness within the linkage, which
would cause stiff steering, poor returnability, or memory steer, rather than
loose, free play in the steering wheel.
7. A vehicle is equipped with electronically controlled variable-assist power
steering. The driver complains that the steering feels excessively light and
overly sensitive at highway speeds. Which of the following could cause this
condition? A. A failed power steering pressure switch stuck open B. The
electronic control unit is failing to output current to the actuator valve at
high speeds C. The vehicle speed sensor (VSS) signal is shorted to voltage,
mimicking high speed D. A restricted power steering return hose Rationale:
Electronically controlled power steering systems generally decrease
hydraulic assist as vehicle speed increases to provide a firmer steering feel
("road feel") and improve high-speed stability. If the system fails to reduce
assist at highway speeds due to a lack of control current to the regulating
, solenoid or valve, full assist will be maintained constantly, causing the
steering to feel unsafely light and over-assisted at high velocities. If the
VSS signal mimicked high speed, it would instead reduce assist at low
speeds, making parking maneuvers difficult.
8. During a 4-wheel alignment, a technician discovers that the thrust angle is
out of specification. Which suspension component is typically adjusted or
inspected to correct this issue? A. Front tie-rod sleeves B. Front strut tower
mounts C. Rear control arms or tracking links D. Front stabilizer bar links
Rationale: Thrust angle is determined by the direction that the rear
wheels are pointing relative to the vehicle's centerline. An incorrect thrust
angle means the rear wheels are steering the vehicle away from its
geometric center, which is caused by shifted or misaligned rear axle
assemblies or rear control arms. Adjusting the rear tracking links or
control arm eccentric bolts centers the rear wheels' tracking line. Front
suspension components have no impact on the rear thrust angle.
9. A driver complains of a severe steering wheel shake or vibration that occurs
only when driving between 55 and 65 mph. The vibration disappears at
lower or higher speeds. What is the most probable cause? A. An out-of-
round tire B. Excessive lateral wheel runout C. Dynamic wheel imbalance D.
Worn upper ball joints Rationale: A vibration that occurs only within a
specific, narrow speed range (typically at highway speeds between 50-70
mph) is a classic symptom of dynamic wheel imbalance. At these specific
speeds, the heavy spot on the tire creates a centrifugal force that matches
the resonant frequency of the front suspension, amplifying the vibration
into the steering wheel. Out-of-round tires or excessive runout typically
cause vibrations that increase progressively with vehicle speed and do not
disappear at higher speeds.
10.A technician is replacing a cartridge-type front shock absorber inside a
MacPherson strut assembly. Before assembling the new component, why
should the technician check the inside of the strut housing for fluid or oil?
A. The oil must be drained completely to prevent hydraulic lockup of the
Certification Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. A technician is inspecting a vehicle with a rack and pinion steering system
and notices fluid leaking from the right-side bellows boot. Which of the
following is the most likely cause? A. A failed outer tie-rod end seal B. A
ruptured internal piston seal C. A faulty rack gear shaft seal D. An overfilled
power steering reservoir Rationale: The bellows boots on a rack and pinion
steering gear are designed to keep dust and debris out of the inner tie-rod
pivots, not to retain high-pressure fluid. If a bellows boot is filled with
fluid, it indicates that the internal end seal of the rack housing has failed,
allowing power steering fluid to bypass the shaft and accumulate in the
boot. Failed tie-rod ends do not contain power steering fluid, a piston seal
failure would cause a loss of assist but not an external leak, and an
overfilled reservoir would vent from the reservoir cap rather than the rack
bellows.
2. During a pre-alignment inspection, a technician finds that the vehicle's front
ride height is significantly lower than manufacturer specifications on the left
side. What is the most appropriate next step? A. Adjust the front camber to
compensate for the sag B. Inspect and replace the sagging front coil spring
before aligning C. Perform the wheel alignment and adjust toe-in D. Shim
the left front strut assembly to restore original height Rationale: Ride
height is a critical baseline measurement that must be verified before
performing a wheel alignment because changes in ride height directly
alter suspension geometry, including camber and toe. A sagging coil
, spring alters the control arm angles, throwing the alignment out of
specification permanently until the structural defect is remedied.
Attempting to align a vehicle with incorrect ride height or using shims on a
non-adjustable strut assembly will result in incorrect dynamic alignment
angles and rapid tire wear.
3. A vehicle pulls hard to the right during braking, but tracks straight when
coasting. Technician A says a seized left front brake caliper could cause this
symptom. Technician B says a worn compliance bushing on the right lower
control arm could be the cause. Who is correct? A. Technician A only B.
Technician B only C. Both Technician A and Technician B D. Neither
Technician A nor Technician B Rationale: Technician A is correct because if
the left caliper is seized and fails to apply braking force, only the right
front brake will decelerate the vehicle, pulling it to the right. Technician B
is correct because a worn compliance bushing allows the control arm to
shift rearward or forward under load; when braking, the force causes the
wheel with the worn bushing to shift rearward, changing the steering
geometry (specifically caster or toe) on that side, which induces a severe
dynamic pull during deceleration.
4. A vehicle exhibits a loud growling noise that increases in intensity with
vehicle speed. The noise becomes significantly louder when the vehicle is
steered to the left, and diminishes when steered to the right. Which
component is most likely defective? A. Right front wheel bearing B. Left
front wheel bearing C. Right outer CV joint D. Power steering pump bearing
Rationale: When a vehicle is steered to the left, the body weight and
centrifugal forces shift to the right side of the vehicle, heavily loading the
right-side wheel bearings. An increase in growling noise when turning left
indicates that the bearing receiving the extra load—the right front wheel
bearing—is damaged or pitted. Conversely, steering to the right unloads
the right bearing, causing the noise to decrease. CV joints typically click
during tight turns rather than growl continuously with vehicle speed.
,5. Which alignment angle is primarily responsible for directional stability and
the steering wheel's self-centering action after a turn? A. Negative Camber
B. Positive Toe C. Positive Caster D. Included Angle Rationale: Positive
caster projects the steering axis forward of the tire's contact patch, which
creates a trailing effect similar to a shopping cart caster wheel. This
geometric layout forces the wheels to travel in a straight line and provides
the mechanical self-centering force that pulls the steering wheel back to
center when exiting a turn. Camber affects tire wear and side-pull, while
toe is adjusted to prevent scrub and stabilize tracking, but neither
provides the primary self-centering directional stability that caster does.
6. While inspecting a conventional steering linkage system, the technician
notes that the steering wheel can be moved several degrees before the
front wheels respond. Which of the following is the least likely cause of this
excessive play? A. Excessive backlash in the steering gear box B. A worn
idler arm bushing C. A loose pitman arm on the steering shaft D. A binding
outer tie-rod end Rationale: Excessive play or looseness in the steering
wheel indicates wear or gaps between components, such as excessive gear
backlash, a worn idler arm, or a loose pitman arm attachment. A binding
outer tie-rod end increases friction and stiffness within the linkage, which
would cause stiff steering, poor returnability, or memory steer, rather than
loose, free play in the steering wheel.
7. A vehicle is equipped with electronically controlled variable-assist power
steering. The driver complains that the steering feels excessively light and
overly sensitive at highway speeds. Which of the following could cause this
condition? A. A failed power steering pressure switch stuck open B. The
electronic control unit is failing to output current to the actuator valve at
high speeds C. The vehicle speed sensor (VSS) signal is shorted to voltage,
mimicking high speed D. A restricted power steering return hose Rationale:
Electronically controlled power steering systems generally decrease
hydraulic assist as vehicle speed increases to provide a firmer steering feel
("road feel") and improve high-speed stability. If the system fails to reduce
assist at highway speeds due to a lack of control current to the regulating
, solenoid or valve, full assist will be maintained constantly, causing the
steering to feel unsafely light and over-assisted at high velocities. If the
VSS signal mimicked high speed, it would instead reduce assist at low
speeds, making parking maneuvers difficult.
8. During a 4-wheel alignment, a technician discovers that the thrust angle is
out of specification. Which suspension component is typically adjusted or
inspected to correct this issue? A. Front tie-rod sleeves B. Front strut tower
mounts C. Rear control arms or tracking links D. Front stabilizer bar links
Rationale: Thrust angle is determined by the direction that the rear
wheels are pointing relative to the vehicle's centerline. An incorrect thrust
angle means the rear wheels are steering the vehicle away from its
geometric center, which is caused by shifted or misaligned rear axle
assemblies or rear control arms. Adjusting the rear tracking links or
control arm eccentric bolts centers the rear wheels' tracking line. Front
suspension components have no impact on the rear thrust angle.
9. A driver complains of a severe steering wheel shake or vibration that occurs
only when driving between 55 and 65 mph. The vibration disappears at
lower or higher speeds. What is the most probable cause? A. An out-of-
round tire B. Excessive lateral wheel runout C. Dynamic wheel imbalance D.
Worn upper ball joints Rationale: A vibration that occurs only within a
specific, narrow speed range (typically at highway speeds between 50-70
mph) is a classic symptom of dynamic wheel imbalance. At these specific
speeds, the heavy spot on the tire creates a centrifugal force that matches
the resonant frequency of the front suspension, amplifying the vibration
into the steering wheel. Out-of-round tires or excessive runout typically
cause vibrations that increase progressively with vehicle speed and do not
disappear at higher speeds.
10.A technician is replacing a cartridge-type front shock absorber inside a
MacPherson strut assembly. Before assembling the new component, why
should the technician check the inside of the strut housing for fluid or oil?
A. The oil must be drained completely to prevent hydraulic lockup of the
