* Worn brake rotors or pads: This is the most likely culprit for shaking during braking.
* Worn or damaged suspension components: Ball joints, tie rod ends, control arm bushings, etc., can all cause shaking, especially under braking forces.
* Wheel bearing problems: A worn wheel bearing can create vibrations that worsen under braking.
* Bent wheels or rims: Damaged wheels will create vibrations that can be exacerbated by braking.
A broken motor mount is more likely to cause vibrations felt throughout the car, particularly under acceleration or deceleration, and might manifest as a shaking of the steering wheel or the entire car body. It's less directly linked to the front-end shake *specifically during braking*.
If you're experiencing front-end shake only during braking, it's far more likely a brake or suspension issue. However, a severely degraded motor mount *could* contribute to a more generalized vibration that *includes* shaking during braking, making it harder to isolate the problem. It's best to have a mechanic inspect your vehicle to diagnose the true cause.
