ASE G1 Auto Maintenance and Light RepairSuspension and SteeringHard
A customer complains that their vehicle constantly 'hunts' or wanders on the highway, requiring frequent small steering corrections to maintain a straight path. The technician performs a thorough inspection and finds no play in any steering or suspension components, and the tires are correctly inflated. Which of the following alignment angles is the MOST likely cause of this condition?
- AExcessive positive camber
- BExcessive toe-in
- CNegative thrust angle
- DInsufficient positive caster
Show answer & explanationAnswer & explanation
Correct answer: D. Insufficient positive caster
Caster is the alignment angle that provides directional stability and helps the wheels return to the straight-ahead position. Insufficient positive caster (or too much negative caster) reduces the self-centering effect, making the vehicle feel 'nervous' and prone to wandering, requiring constant steering input to keep it straight.
Why the other options are wrong
- A. Excessive positive camber causes wear on the outer shoulder and can lead to a pull, but not typically constant wandering.
- B. Excessive toe-in causes scuffing and rapid tire wear, and can make the steering feel heavy, but usually leads to a stable (though misaligned) straight line, not wandering.
- C. A negative thrust angle causes the vehicle to 'dog track' and possibly pull, but doesn't typically cause constant wandering if other angles are correct.
Insufficient Caster Wander
When a vehicle exhibits a tendency to 'hunt' or wander on the highway, requiring constant minor steering corrections, often due to insufficient positive caster angle, which reduces directional stability.
- Caster provides directional stability.
- Low positive caster causes wandering.
- Steering feels 'nervous' or 'light'.
Memory trick: Low caster's a 'flaw', car can't stay 'on the straight and narrow'.