Introduction
If your car has been making a clunking or knocking sound over bumps — especially from the front — and your absorbers have already been checked and are fine, the culprit is often the lower arm bush. It’s one of those components most drivers have never heard of, yet it plays a critical role in how your car handles.
What Is a Lower Arm Bush?
The lower arm (also called the control arm) is a metal link that connects your wheel hub to the car’s chassis. It allows the wheel to move up and down with the road while keeping it in the correct lateral position.
The lower arm bush is the rubber-and-metal cylindrical insert at the pivot points where the lower arm connects to the chassis. It acts as a flexible cushion — allowing the arm to rotate slightly as the suspension moves while absorbing vibration and preventing metal-on-metal contact.
Why Bushes Wear Out
Lower arm bushes are made of rubber, which degrades over time due to age, heat, oil contamination, and repeated flex cycles. In Malaysia’s tropical heat, rubber degrades faster than in cooler climates.
Heavy potholes and kerb impacts can cause accelerated cracking and tearing of the bush material. Once the rubber is worn or torn, the lower arm starts to move excessively — and that’s where the knocking comes from.
Symptoms of Worn Lower Arm Bushes
Clunking or knocking from the front suspension over speed bumps or uneven roads.
Car feels vague or imprecise when steering, especially at highway speeds.
Excessive vibration through the steering wheel on rough roads.
Uneven or accelerated tyre wear.
Car pulling to one side despite correct wheel alignment (the worn bush allows the wheel geometry to shift).
Can You See If the Bush Is Worn?
Yes — during a workshop inspection with the car on a lift, a mechanic can physically grab the lower arm and try to move it. Excessive movement indicates the bush is worn. Visible cracking, tearing, or separation of the rubber from the metal sleeve are also clear signs.
Visual inspection through the wheel arch can sometimes reveal obvious bush damage, but a proper assessment requires a lift.
Replacing Lower Arm Bushes at Chico Auto Supply
Chico Auto Supply carries lower arm bush sets for major Malaysian car brands including Perodua, Proton, Honda, Toyota, Nissan, Hyundai, Mitsubishi, and Mazda. We stock FEP and KYB branded bushes depending on your vehicle.
When replacing absorbers, it’s worth having the lower arm bushes inspected at the same time — they often wear in a similar timeframe.