Is it necessary to replace the lower control arm if it's been hit?
3 Answers
If it's a minor impact, replacement is not necessary. However, if the lower control arm is deformed, then replacement is advisable. Below is relevant information: 1. Overview: The lower control arm in a car's suspension system plays a role in bearing loads, guiding the wheels, and absorbing vibrations. The rubber bushings of the lower control arm are prone to cracking after some use and need timely replacement; otherwise, it may affect the vehicle's stability and handling. 2. Additional Information: Control arms are made from various materials, including aluminum alloy, cast iron, double-layer stamped steel, and single-layer stamped steel. Each material has its pros and cons. Stamped steel parts have good toughness but lack sufficient strength and are prone to breaking upon impact.
As a family driver who frequently drives, I am most concerned about car safety issues. If the lower control arm has been hit, it indeed needs careful evaluation to determine whether replacement is necessary. The lower control arm is a crucial component of the suspension system. If it becomes deformed, cracked, or loose after impact, it can cause the vehicle to pull to one side, unstable handling, or even lead to loss of control at high speeds. I recommend performing a preliminary self-inspection: park on a level surface, feel the lower control arm for any deformation, cracks, or unusual noises; try shaking the tire to check for significant looseness. If the damage is noticeable, it must be replaced—don’t risk safety to save money. I’ve learned this the hard way before, as it led to accelerated tire wear and costlier chassis repairs. The material cost for replacing a lower control arm might be a few hundred yuan, but it could be more expensive at a 4S shop when including labor fees. However, investing in safety is always worth it. During regular maintenance, it’s best to have a technician inspect the suspension—prevention is better than dealing with accidents later. In short, safety comes first—don’t take chances after an impact.
I've had several experiences fixing cars myself. A damaged lower control arm is no small matter—it depends on the specific situation. Minor scratches might not require immediate replacement, but if it's deformed, it needs immediate attention. Cost-wise, a new part typically ranges from 200 to 500, plus labor fees. If left unreplaced, it can wear out tires and shock absorbers over time, potentially doubling repair costs. I'm pragmatic—I'd first jack up the car to inspect the damage. If it's not deformed, I'd keep using it; if deformed, I'd replace it at a shop. This part affects the entire steering system. If the steering wheel shakes at high speeds, it's a warning sign. Also, check the underbody protection during maintenance to reduce impacts. Saving money is good, but don’t joke about safety.
