Heavy vibration at high speed/brakes

After very long abstinence I am back in the forum again, hope everyone is doing well… My meanwhile 9 year old moose is increasingly worrying me…I hope someone has the ignited idea what it can be about…… The symptoms: The Volvo drives on the BAB up to approx.160 km/h almost vibration-free starts then but with increasing speed up to approx.180 km/h strongly to shake up and down with the steering wheel, the whole steering column moves! Over it calms down, below it is the It’s even more intense when braking. Strong braking from high gears ( unfortunately happens quite often on the BAB ) makes the car almost non-driving, the steering column moves up and down and in the brake pedal is also a vibration to feel ( has nothing to do with the ABS stuttering, if someone wants to anticipate that, the brakes are not so violent 😉 ) Already replaced : 1. tyres / wheels 2. brake discs front ( 2 times ) + brake disc ben rear 3rd crossbars (the big trapezoidal handlebars) 4th trackbar heads left and right 5th engine suspension top 6th engine suspension bottom 7th wheel bearing Overpumps were also the stist dampers. I don’t know any more, it will soon all be new and the symptoms will remain. I would next replace the sockets of the auxiliary frame ? Can the clutch (ruffles slightly ) cause this symptoms ? Two-mass swing wheel ? My workshop also has only question marks left for me…. Who kan n help me ? Given thanks ! makeve