Have Braking vibration, Brake shop says lower bushings???

[Schrei-x5]

Ok I have a 2003 X5 119,000 mi I had the front brakes done about 3 months ago well all was fine, but in the last few weeks the steering wheel started to vibrate when I press on the brakes. So I took it back thinking it was the brake job warped rotor or jammed caliper etc....

They brake tech told me to come out and he was slowly back and forwarding the car with light braking and the wheels were shimming a little bit. He said it is the most likely the lower bushings (I think he means the lower control arm bushings) He also said this is common.

Is this true??? And what is the average cost of replacing this? And do you guys think this is a logical diagnosis?

Please help!!!