Car shakes when braking
The buyer question: "car shakes when braking"
This affects a safety system. End the test drive if braking feels weak, the pedal feels soft, the car pulls hard, stopping takes longer, or you hear grinding or smell burning.
What could cause it
More than one problem can cause the same symptom. These are places to inspect, not a diagnosis.
- Brake friction or rotor problems
- Uneven tire wear, a damaged tire, or a wheel balance issue
- Worn steering or suspension components
- A sticking brake component or another problem that changes braking force
Safe things to check
Keep clear of moving parts, hot components, and traffic. Use the owner's manual for vehicle-specific instructions.
- With the car parked, look for a visibly damaged or very low tire
- Notice whether the shake is in the steering wheel, pedal, seat, or whole body
- Check the brake and tire warnings in the owner's manual
Stop driving and arrange a tow or professional advice if the pedal is soft, the vehicle pulls, braking distance changes, grinding is loud, or smoke or a burning odor appears. Brakes are a control system, not a cosmetic issue.
What a mechanic may check
A mechanic may measure the brakes and wheels, then inspect pads, rotors, calipers, tires, wheel bearings, steering linkage, and suspension for play or uneven wear.
If you are considering this car
On a used-car test drive, ask the seller about any braking vibration and request a written inspection. Brakes that supposedly need to be warmed up still need a diagnosis.
Questions for the seller
- Does the shake happen only under light braking or also during hard braking?
- When were the brake pads, rotors, tires, or suspension last inspected?
- Will you allow an independent pre-purchase inspection?