Clicking when turning: driveshaft joint, top mount, or brakes

Clicking on lock is one of the few symptoms with an almost unambiguous diagnosis. But “almost” matters here: there are two other candidates, and both are cheaper than the first.

The main suspect: the outer CV joint

The characteristic sound: rhythmic clicking on lock under load — that is, accelerating with the steering turned. It is absent in a straight line.

The tighter the turn and the harder the throttle, the louder it gets. That is the CV joint’s signature.

Which side: clicking on left lock usually means the right-hand joint, and the reverse. The test is simple — figure-eights on an empty car park.

Why the boot is the culprit, not the joint

The main practical point of this topic.

A CV joint lasts a long time while it has grease and no dirt inside. The boot — the rubber gaiter — keeps one in and the other out.

Once the boot splits:

1. Centrifugal force throws the grease out.
2. Grit and water get in.
3. The abrasive destroys the joint in weeks.

So: a crack in a boot is a cheap repair today and a new driveshaft in a month. Inspecting boots at every oil change takes five minutes.

The visible sign: grease traces on the inner face of the wheel and in the arch. It is flung in a circle and shows clearly.

The second candidate: the strut top mount

The sound: a click or crunch when turning the wheel while stationary or at low speed, unrelated to throttle.

Additionally: knocking over bumps, steering that self-centres reluctantly, and a “tight” sound on lock.

The difference from a CV joint: the joint clicks under load while moving, the mount clicks as the steering itself rotates.

The third candidate: brakes

The sound: a single click or squeak on lock, often with light braking.

The cause: the pad moves in its guides, and a change in load angle shifts it. Often after a pad change without lubricating the slides.

The cheapest of the three; brake noises have their own article.

What diagnostics sees

A scanner cannot hear mechanical noise, but adjacent systems offer clues.

ABS sensor codes — heavy joint or bearing wear changes the sensor gap and destabilises the signal.

The four wheel speeds in live data — a wandering value on one wheel.

Steering angle sensor codes — with a worn top mount or steering components.

But the main tool here is figure-eights and a boot inspection, not a scanner.

The checking order

1. Figure-eights on an empty car park — on and off throttle, both directions.
2. Inspect both outer boots for cracks and grease traces.
3. Turn the steering while stationary — a crunch without motion points at the top mount.
4. Inspect arches and wheels for flung grease.
5. Check the pad slides if the noise is a single click.

In short

• Clicking on lock under throttle is the outer CV joint.
• Clicking as the steering rotates while stationary is the top mount.
• A split boot kills the joint in weeks; check it at every oil change.
• Grease in the arch is a visible sign before any noise appears.
• Figure-eights separate the causes faster than a ramp does.

Download the app — ABS codes and wheel speeds are read with an ELM327 adapter over Bluetooth SPP on Android.