You don't say if it has just started shaking or if it's been around for a while?
Check for anything jammed between disc(rotor) and the hub. A tiny bit of dirt could throw the disc out of true.

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My Car
_ _ _ _ ___ _ _ _ _
2001-ST200 Ltd Edition Saloon-#102/300
Green Indiglo\'s
Blue Indiglo\'s
Genuine Ltd. Edition Ashtray
Polished Alloy Wheel Centre Nuts
Engraved & Polished Alloy Battery Strap
Blitz SUS C3 Induction Filter
Dyno\'d at 210 BHP!!
Modified and superfinished throttle body
Black Diamond X-Drilled/Grooved front discs/EBC TGD Rear discs Greenstuff Pads all round
Full Goodridge Stainless Steel Braided Lines
One Off Two, ST200 Nickel Plated Alloy Pedals
Colour Coded Window Washers
Engine Lighting
*New* Billeted Alloy Oil Cap
*Blue Footwell Lights*
*Blue Rear Underseat Lights*
*Blue LED Door Handle Lights*
*Clear Repeaters*
*Blue alloy valve stems/caps*
*Pre Cats gone**
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