When I brake at high speeds, lets say 120, 140, 160 I get a wobble in the front end. The steering wheel shakes quite hard....

The tire pressure is as recommended, the tires are even and not worn down

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190e 2.6 1990. 300,000 KM
C230 K 2000, 130,000 KM

It sounds like steering dampner needs to be replaced, it's an easy job it's a horizontial looking shock absorber, could also be warped brake rotors, I would take off one side of the steering dampner and see if it still has resistance, if not replace they test drive and if it still happens , time for brakes

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Jerry

2004 SL500 Black 55K Miles
2002 s500 Black 90K Miles
1986 300E Gold 233K Miles
1966 Twin Cessna 320D
1989 Jeep Cherokee 233K Miles
1994 Ford Van E150 399K Miles

Alright good reply, I have suspected the rotors but would not have thought about the dampner. Unitl you mentioned it.

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190e 2.6 1990. 300,000 KM
C230 K 2000, 130,000 KM