What Are the Reasons for Car Shaking When Braking?
4 Answers
The reasons for car shaking when braking are: 1. Uneven brake disc surface with excessive radial runout; 2. Significant deviation in wheel alignment data; 3. Tire pressure being too high or too low; 4. Abnormal tire wear; 5. Wheel rim deformation. The function of brakes is to reduce speed or bring the vehicle to a stop. The working principle involves converting the kinetic energy of the moving vehicle into heat energy through friction between the brake pads and brake drum, as well as between the tires and the ground, thereby slowing down or stopping the vehicle. Brake maintenance methods include: 1. High-temperature resistance protection to prevent brake system corrosion, avoid brake pad seizure due to high temperatures, and eliminate brake pad squealing; 2. Regularly replacing brake fluid; 3. Cleaning oil stains, dirt, and friction dust from brake discs, brake drums, and any related parts to ensure good heat dissipation of the brake discs; 4. Regularly checking the thickness of brake pads or brake shoes.
When I first started driving, the car would shake violently when I hit the brakes, especially after hard braking at high speeds. The vibration traveled from the steering wheel through my whole body—it was really scary. Later, the mechanic told me the main reasons could be warped brake rotors, as sudden braking at high temperatures can cause them to bend. It could also be unevenly worn brake pads leading to unstable friction, or improper wheel balancing causing excessive wobble during rotation. Worn or loose suspension components like ball joints can also make the car shake during braking. This issue can’t be ignored—shaking increases braking distance, making it even more dangerous in rain or on mountain roads. I suggest getting it checked by a professional shop immediately if noticed, replacing rotors/pads or rebalancing the wheels. Also, try to brake gradually in daily driving and avoid sudden stops to prevent similar issues.
Brake pedal vibration is mostly caused by issues with the brake discs or pads. For example, disc warping often occurs after continuous use when temperatures rise. Poor-quality brake pad materials or uneven wear can amplify the vibrations. Additionally, loose wheel bearings or damaged hubs can also cause shaking during braking. When the ABS system functions normally, it provides a smooth pulsating sensation; if faulty, it may cause abnormal vibrations, though this is relatively rare. Suspension system components like damaged tie rods can also lead to instability. I usually start by test-driving to identify the vibration pattern, then use specialized tools at the workshop to check disc and pad flatness. Timely repairs are crucial to prevent accelerated component wear. Choosing high-quality replacement parts during maintenance can save future trouble.
When the car shakes while braking, it could be due to warped or uneven brake rotors. Uneven wear on the brake pads can also cause this. Another common reason is wheel imbalance or foreign objects stuck in the wheel hub. Aging or loose suspension components, such as stabilizer bars, can also trigger vibrations. If you notice this issue, take your car to a repair shop immediately for inspection—they can test for flatness and dynamic balance. Don't delay, as postponing repairs may damage more components and reduce safety. I recommend developing good braking habits, such as easing off the accelerator early to slow down in congested areas.
