A clunking noise from the front suspension over bumps and potholes is common on the Highlander XU70. Likely culprits include worn sway bar links, strut mounts, or control arm bushings—here’s what to check and whether it’s safe to keep driving.
What’s Causing That Clunk?
When you hear a distinct clunk or thud from the front end hitting bumps or potholes in your Toyota Highlander XU70, it’s almost always a loose or worn mechanical component in the suspension. Unlike a rattle or squeak, a clunk signals that two parts are contacting each other with too much clearance. The most common sources are:
- Sway bar end links – These small links connect the stabilizer bar to the strut or control arm. Their ball joints wear out, causing a metallic clunk when one wheel rises or drops.
- Strut mounts or top hats – The rubber isolator at the top of each front strut can degrade, allowing the strut piston to knock against the chassis.
- Control arm bushings – The lower control arm’s rubber bushings, especially the rearward one, dry out and develop play, leading to a thud over bumps.
- Ball joints – Lower ball joints on the Highlander can develop noticeable play before they fail, producing a heavy clunk when turning or hitting potholes.
