Hi I have a VX and when you turn left a bit and brake there is a shudder but if you apply a bit harder or turn left slightly more it fades out, does not do it in a straight line or if you turn right would this be a tie rod or rack end I have replaced the rotors not that long ago?
Could be tie rod end. Next time ur at ur car make sure the wheel is straight and grab it with both hands and try to turn it left and right. If its tie rod end you'll hear it clunk on each push and pull, also look at the bushes.
Another key factor is the disc could be warped and also running bare on brake pads.