My P38 drives really nicely but has developed a horrible shimmying through the steering when braking. There is a bit of play in, I suspect, the steering box (all rod ends are good, hub swivel ball joints replaced with good quality items 2 years ago, can't feel any slop in steering column linkages under the bonnet) but I feel no vagueness or wandering of the steering at all. The front discs are fairly recent and there is no pedale pulsing or dragging of the brakes. Take your foot off the brakes and it stops. The car drives straight and true so I don't believe any of the axle bushes are worn. Are these classic symptoms of anything? If it where an E34 5 series BMW I'd go straight for the upper track control arms but it isn't and so it doesn't have any.
Any help greatfully recieved.