Most Likely Causes:
* Loose Wheel Lug Nuts: This is the most common and easiest to check. If the lug nuts aren't tight enough, the wheel can wobble, causing a clicking sound, especially when braking or going over bumps. Check this FIRST. Use a lug wrench to tighten them (don't overtighten!). If you're unsure how to do this safely, take it to a mechanic.
* Worn-out Wheel Bearing: A failing wheel bearing will often make a clicking or grinding noise that changes pitch with wheel speed. The noise may be worse when turning. This is a serious issue that needs professional attention.
* Brake Components: A problem with the rear brake components, such as a worn-out brake pad, sticking caliper, or a problem with the parking brake mechanism, could produce clicking sounds. You might notice other symptoms like brake squealing or pulling to one side.
* Suspension Issues: While less likely to cause *clicking*, worn suspension components (ball joints, control arm bushings) can sometimes produce clicking or knocking noises, particularly over bumps.
Less Likely, But Possible Causes:
* Debris in the Brake Caliper: Sometimes small stones or other debris can get lodged in the brake caliper, causing a clicking sound.
* Something Stuck in the Tire: Though less likely to cause a consistent click, something might be caught between the tire and the wheel well.
How to Diagnose:
1. Check the lug nuts: This is the most important first step.
2. Listen carefully to the sound: Does it change with speed, braking, or turning? This helps narrow down the possibilities.
3. Inspect the tire and wheel visually: Look for anything obvious, such as loose parts or damage.
4. Jack up the vehicle (safely!): This allows you to carefully rotate the wheel and listen closely for the clicking sound. Check for play in the wheel bearing by attempting to move the wheel up and down and side to side.
5. Brake test: Test the brakes gently to see if the sound changes or disappears.
When to See a Mechanic:
If you're uncomfortable checking the lug nuts or if the clicking persists after checking them, or if you suspect a wheel bearing or brake issue, take your vehicle to a qualified mechanic immediately. Ignoring these issues can be dangerous.
