Possible suspension issue?

[03Q45st1]

03 Q45 with 107k miles: When applying brakes, a rocking-vibration motion seems to be transmitted thru the car body....more intense at highway speeds. So far the only troubleshoot done was to inspect brakes and they passed. Could this be related to the need to change out the u-joint, motor mounts, etc.?. Any clue as to where to focus would be greatly appreciated. Thanks.

[Q45tech]

When were shocks last replaced? Since they only function well for 4 years or 60k this is the place to start!

Everything rubber isolated is worn {degraded from rubber changing due to heat cycling and ozone] and must be change if you expect near new functioning!

Then check rotor run out against oem 0.0028" spec.

[03Q45st1]

I'm not aware of the shocks ever being replaced; purchased the car about 3 years ago....rotor run out came in per spec......I'll move forward on looking at the shocks; thanks for the input.