What Causes the Car Brake Pedal to Shake?
2 Answers
Brake pedal shaking can be caused by the following reasons: 1. First, rule out a normal phenomenon where the ABS system causes brake pedal rebound during emergency braking. 2. Check if the brake discs and pads are severely worn and whether the runout exceeds tolerance. Measure and replace any faulty components if necessary. 3. When braking on slippery roads, the ABS anti-lock system activates, causing the brake pedal to vibrate. Here are solutions for brake shaking: 1. Uneven surfaces on the brake disc, hub face, or axle hub face require replacing the brake disc. 2. Manufacturing errors in the brake disc leading to shaking necessitate replacing the brake disc. 3. Uneven torque on the floating disc or hub bolts causing unevenness requires reinstalling the brake disc. 4. Improper bedding-in process preventing even transfer of brake pad material onto the disc—adjust brake clearance. 5. Dragging brakes or poor driving habits causing uneven pad contact—improve braking habits and replace pads regularly.
My car's brake pedal has also vibrated a few times recently, and I found it was mainly caused by uneven brake rotors. After prolonged use, uneven heating can easily warp the rotors, and when braking, the uneven surface can cause pedal vibration. Uneven wear of brake pads is another reason—if the pads on the left and right wheels wear differently, braking force becomes unbalanced. Additionally, wheel imbalance or loose wheel bearings can also transmit vibrations. This issue is quite critical, especially at high speeds, as vibrations can increase braking distance and raise the risk of rear-end collisions. I recommend taking time to visit a repair shop for an inspection. They can use instruments to measure whether the rotor surfaces are even and check the thickness of the brake pads—if they're too thin, they need replacement. When driving normally, avoid frequent hard braking to extend the lifespan of these components.
