Vibration when applying brakes is most likely warped rotors. Another cause could be loose caliper bolts.
Warped rotors
roters need turned. 65;
Warped brake rotors.
You need an alignment.
You have a warped rotor. It must be trued at a machine shop or replaced.
Most likely warped rotors
You need the front rotors machined or replaced.
Need more info like what is the vehicle doing when it shakes, is it idling in park, driving down the road, braking, driving at highway speeds, etc.
if it shakes while your braking your front roters could be warped or if it shakes while your driving try balancing the tires at a tire shop.
if you car shakes when its fully stopped it may be the harmonic balancer, take it to a garage. is it shakes only when you are braking while stopping than have you brakes checked
the brake rotors are warped. resurface or replace rotors. if the vehicle shakes without applying the brakes, check tire balance.
If it shakes all the time it is a tire/wheel problem. If it only shakes when braking then it is a brake problem.