What Causes Body Vibration at 120 km/h on the Highway?
2 Answers
There are two main reasons for steering wheel vibration when braking at 120 km/h on the highway. Below are the relevant explanations: 1. Uneven brake disc wear: When the brake discs are unevenly worn, steering wheel vibration may occur during high-speed braking. When braking at a certain speed, the left and right wheels on the same axle may experience uneven braking force, causing an alternating tight and loose braking effect. If this imbalance reaches a certain level, it can lead to unequal rolling speeds between the left and right wheels, resulting in side-to-side wheel oscillation, which is then transmitted to the steering wheel. 2. Drivetrain malfunction: Another possible cause of steering wheel vibration during high-speed braking is an issue with the vehicle's drivetrain. In such cases, it's advisable to check the tie rods and tie rod ends for rust or looseness.
When driving at 120 km/h on the highway, body vibration can have multiple causes. This is usually due to dynamic tire imbalance, where the center of gravity shifts during high-speed rotation, causing vibrations. Another possibility is incorrect wheel alignment, such as front wheel angles deviating from factory settings, leading to unstable driving. Aging suspension components, like failed shock absorbers or worn bushings, can also amplify the vibration. Once during a long-distance drive, I encountered a similar issue, which turned out to be warped or unevenly rusted brake discs. Another factor is driveshaft imbalance, which is common in rear-wheel-drive vehicles. These vibrations not only make driving uncomfortable but can also accelerate tire wear and even affect safety. It's recommended to slow down to below 100 km/h to test. If the vibration lessens, it's likely a balance issue—promptly visit an auto repair shop for dynamic balancing and four-wheel alignment checks to avoid bigger problems later.
