Have the rotors and drums turned and then check for brake pedal free play.
Its possible that the rod wasn't
adjusted right when the new booster was installed and you had brake drag that
warped your rotors and/or drums.
I have come across it before.
| Hey all
| got a 78 1/2 ton 4x4, just got the brakes fixed(booster) anyway, around 30
| or so, it wants to buck, not like a vibration, but like a damn gallop?
| Anyway, I just had the tires balanced and rotated, didn't help a thing. any
| help would be greatly appreciated