What Causes the Brake to Shake?

[VeraRose]

The reasons for feeling brake shake when pressing the brake pedal are as follows: 1. The brake disc surface is uneven, with excessive radial runout. During braking, the brake pads intermittently contact the brake disc, causing fluctuating braking force and resulting in vehicle vibration, especially noticeable when lightly pressing the brake. 2. Significant deviation in wheel alignment data, particularly incorrect front wheel alignment angles or excessive toe-in. This makes the vehicle difficult to control during acceleration, with slight but noticeable discomfort while driving. 3. Tire pressure is either too high or too low. Overinflated tires cause more severe vibration at higher speeds, while underinflated tires lead to a floating sensation and pulling to one side. Specific tire-related causes of brake shake include: 1. Wheel rim deformation. When mounted on a deformed rim, the tire also deforms, leading to an uneven surface and unbalanced wheel dynamics, causing vibration while driving. 2. Abnormal tire wear. Due to incorrect wheel alignment or rim deformation, the tire surface wears unevenly, resulting in vehicle vibration during driving.