Steering Shudder in Subaru Liberty RX

If you haven't had the brakes checked, do so, as it could be the brake rotors causing your steering shudder. I wouldn't be expecting to rebuild the suspension as such, although you could have a suspension specialist check the shock absorbers for you. Likewise, I wouldn't be expecting the auto to pack up just because it's racked up 100,000km, particularly if it's driving normally without a sign of a problem.