Introduction to the causes of steering wheel vibration when braking while driving: 1. Tire deformation: Lift the front axle and rotate the wheels to check the static balance of the wheels and whether the tire or wheel hub is excessively deformed. If deformation is found, replacement is necessary. Steering wheel vibration typically occurs at speeds between 80 km/h and 90 km/h and returns to normal when exceeding 90 km/h. This is mostly caused by tire deformation or issues in the vehicle's drivetrain. 2. Incorrect tire dynamic balance: If the tire dynamic balance values are inaccurate, the steering wheel may vibrate within a certain speed range. Wheel dynamic balance needs to be recalibrated. Check if the front wheel alignment angles and toe-in meet requirements; adjust if necessary. 3. Drivetrain malfunction: Issues in the vehicle's drivetrain can cause this problem. Check if the front wheel alignment angles meet requirements and adjust if necessary. 4. Worn or loose half-shaft/tie rod ball joints or detached rubber bushings at joints: Replace damaged components. The vehicle may drive normally on flat roads but exhibit steering wheel vibration on bumpy roads. This is due to worn or loose tie rod ball joints, detached rubber bushings, or irregular tire wear. Professional inspection and replacement of damaged parts are required. 5. Twisted or deformed drive shaft, or loose, dry, or rusted universal joints: These components are located under the vehicle and are often overlooked during maintenance. Ensure that maintenance personnel apply grease to lubricatable areas during each service. 6. Warped brake discs: This issue mainly manifests as steering wheel vibration during high-speed braking. The brake discs may need replacement or resurfacing. Sudden braking at high speeds can cause steering wheel vibration. Excessive or frequent braking may overheat the brake discs and pads, leading to deformation when cooled. Symptoms usually resolve after replacing the brake discs and pads. 7. Overly loose or tight power steering belt: Primarily affects vehicles with mechanical hydraulic power steering. This issue can cause significant steering wheel vibration when turning. Adjust the belt tension or replace the belt as needed.
