[Mgs] wobble

[1971-red-mgb]

I've experienced an phenomenal that's new to me on my 71 MGB and that is every
time I apply the brake my front starts to wobble, the wobble is transferred
from the front all the way up the steering wheel which has a site to site
vibration, when I let off the brakes all seems normal.  I had the wheel
balanced two days ago and al is well with that,.
any thoughts of where I should start looking ?