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If it vibrates all of the time, and not just while braking, your culprit will invariably be imbalanced tires. The most common speed for imbalanced tires to start causing vibrations is around 40-45 MPH.
You can have looseness in other steering components that will cause clunkiness, but it is rare that loose bushings, ball joints and such will cause an even, pulsating vibration. Worn suspension or steering components will make the vibrations of imbalanced wheels sound and feel much worse (and imbalanced wheels will in turn hasten the demise of failing weak suspension/steering components), but they won't in themselves set up vibrations.
If your car only vibrates while braking at high speeds, imbalanced tires are not the culprit. Neither are your calipers or wheel bearings. Usually it's the discs. How do you know for sure the rear discs are true? And just because your front discs are new doesn't guarantee that they weren't dropped in shipping or manufactured incorrectly. These things are not common, but not unheard of. Get all of your discs checked for run out before you do anything else.
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