Clicking on Turns and a Pull to the Left After New Tyres
A front-wheel-drive petrol hatchback has covered 48,000 km. The driver reports a rhythmic clicking from the front right when turning at full lock, a pull to the left on a level road, and a steering-wheel vibration between 80 and 100 km/h. Inspection shows the right outer CV joint boot is torn and grease has been thrown onto the inner wheel arch; the right front strut has a light oil film; both front tyres have worn inner edges but the left tyre is worn more. Wheel alignment readings: front toe left +0.45°, right −0.15° (total toe +0.30°), camber left −0.2°, right −0.9°, caster within specification. Tyre pressures are correct. The owner recently replaced both front tyres and wants only a wheel alignment to cure the pull and vibration.
1. Diagnose the likely causes of the clicking, the pull and the vibration. Distinguish between what is proven and what still needs testing.
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The clicking at full lock is the strongest clue. A torn outer CV boot throws grease out and lets water and grit in, so the joint balls and cage wear. Clicking under lock is the classic result. That is proven by the torn boot and the noise, though the joint should still be checked by hand for play.
The pull to the left is supported by the camber readings: left −0.2° and right −0.9°. The difference is 0.7°, and a vehicle usually pulls toward the side with the more positive camber - here the left. That much camber difference can come from a bent strut, worn knuckle, damaged lower arm or a shifted subframe. The oil film on the right strut is a warning, but a light film alone does not prove the strut is bent; it needs a runout or camber check after repair.
The 80–100 km/h vibration is not proven. It could be the worn CV joint, but new tyres should be checked for balance, runout and correct seating on the rim. A bent strut can also affect alignment but rarely causes a pure speed-related vibration. Test wheel balance and runout before blaming the joint alone.
2. Explain why a wheel alignment alone will not fix the pull and uneven tyre wear.
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Alignment adjusts angles that are adjustable, but it cannot straighten a bent strut, knuckle or lower arm. The camber split of 0.7° is the main pull cause; if the right strut or knuckle is bent, setting toe will not correct camber. The car will still pull and the new tyres will still scrub.
The toe readings also show a steering-direction problem: left +0.45° and right −0.15° means the individual toes are not symmetric, even though total toe is only +0.30°. That can put the steering wheel off-centre and load one tyre more. If the alignment is reset without repairing the bent part, the next bump or load change will move it again.
Uneven inner-edge wear is consistent with camber and toe error, but the left tyre wearing more than the right shows the problem is not a simple single-wheel toe setting. The correct order is repair first, alignment last.
3. Recommend a repair sequence and explain why the order matters.
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- Replace the torn CV boot and inspect the joint. If it clicks under load or has play, replace the complete outer joint or driveshaft; a boot alone will not cure a worn joint.
- Inspect the right strut, knuckle, lower arm, ball joint and wheel bearing. Compare camber after fitting known-good parts. Replace the bent strut or knuckle if the camber cannot be brought within specification.
- Check wheel balance and rim runout on both front wheels, and correct tyre pressures.
- Only then perform a four-wheel alignment, centre the steering wheel, and road-test.
The order matters because alignment is a measurement of the final geometry. Aligning a bent suspension copies the fault into the new tyre wear pattern. Balancing before alignment avoids confusing a vibration with a pull. Road-testing after alignment confirms both the repair and the steering-wheel position.