Most common causes
- Uneven rotor thickness from heat
- Pad material deposits on the rotor
- Sticking or seized caliper
- Worn tie rods or control arm bushings
- Improperly torqued lug nuts
Where you feel it tells you where to look
Shaking in the steering wheel points to the front rotors. Pulsing in the pedal or seat points to the rear.
Is it safe to drive?
Mild vibration isn't an emergency, but it lengthens stopping distance. Get it inspected within a week or two.