Re: front end shaking
You can try swapping the wheels (front to back), and see if that changes anything, as jwko mentioned, it's more than likely warped rotors.
Just a thought, but if you find yourself braking hard when going downhill, shift the transmission into a lower gear for longer decents to save the brakes. As in almost anything automotive - heat is your enemy.
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!