In general, warped brake rotors will cause a vehicle to shake when the brakes are applied. If the problem is severe, it will also have some impact on the ability of the driver to control the car when braking. If a car shudders or shakes when the brakes are applied but is otherwise smooth when driven, the brakes are a most logical cause. Use the link to the related question below to help you decide what to do if you suspect a warped brake rotor.
worn front end parts (steering or suspension) could cause a car to shake when appling the brakes.
Vibration when applying brakes is most likely warped rotors. Another cause could be loose caliper bolts.
is this 4 wheel drive
If it only happens when you accelerate the most likely cause is an axle.
Tires,inner tie rod bushings, if the steering wheel shakes when brakes are applied - brake rotors warped.
possibly loose?? or engine runnability problem. Alos drivetrain vibration or wheel balance problem will cause it
Bent rim. If you rotate it to the rear it may eliminate problem. Have the wheels inspected and replace a bent one. Putting it on the rear will cause your rear axle bearings to wear out. Do not mount a bent wheel on your car, replace it.
If the brakes on a Mazda 6 are squeaking, it could be indicative of a problem. The brake pads could be incorrectly set.
If it shakes only when the brakes are applied, its the brakes. Just because they are "good" and stop the truck well doesn't mean they are balanced and wont cause a vibration.
I had a similar problem once and it had something to do with my brakes, I'd get them checked if i were you
Sure if your calipers aren't open enough and your brakes stick