Just had new front & back pads put on and discs machined. High speed braking makes my steering wheel shudder like its going to fall off!

Rang the mechanic and he said I'd have to bring it back and he would have to re-machine the wheels.

Is it possible that the discs could be warped? It feels like it

Hope someone can shed some light here!

could be your rotors but if you've had them machined it shouldnt be the case.

wheel bearings might need adjusting??
check tie rod ends arent flogged out

anything that is around that area

Warped rotors
Loose wheel bearings
worn or loose tie rods (inner or outer)

by high speeds do u mean at about 110km/h??? prob warped rotors i reckon...