Under normal circumstances, when you press the brakes and experience steering wheel shaking, it is due to excessive runout in the brake pads and brake discs. In simple terms, the brake disc is not perfectly flat, and the runout between the brake pads and the brake disc causes a slight vibration in the brake pedal when the driver applies the brakes. This vibration is then transmitted through the transmission system to the steering wheel, resulting in the sensation of a shaking steering wheel.
Additionally, if you experience steering wheel shaking or resonance when braking at speeds over 80 KM/H, it is most likely caused by tire deformation or issues in the vehicle's transmission system. You should first check the balance weights on the wheels. If a balance weight falls off or is missing, it can lead to steering wheel shaking issues. When adding balance weights, it's essential to ensure that both the longitudinal and lateral vibration amplitudes are less than 0.3mm.
Next, check if the front wheel alignment angles and toe values meet the standard requirements, and raise the vehicle to inspect the feedback from rotating the front wheel axle and the dynamic balance of the wheels. Balancing the wheels is crucial to prevent tire-related vibrations at high speeds, which can further affect the steering wheel. Since the front wheels are rotating wheels, their dynamic balance is of utmost importance. If the issue persists after these checks and adjustments, you should inspect the vehicle's suspension system, including components like the lower control arms and tie rod ends, for any looseness.
The braking system works by converting the vehicle's kinetic energy into heat energy and dissipating it. This kinetic energy comes from the engine's power, which is provided through the consumption of fuel. To reduce steering wheel shaking, it's advisable to apply the brakes reasonably and moderately while maintaining a safe following distance, which can help reduce the frequency and duration of brake pedal application.
