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Hi,
It's most likely 11mm, at least it was on my '99 and also a buddy's. I've never seen a 9mm - most metric bleed screws are 10mm such as the ones from the brake line to the Caliper. These Bleeder screws can weld themselves to the Caliper because of the corroding effect of Brake Fluid making them difficult to open. Add to that, you want to get them tightly closed to avoid fluid loss or air infiltration.
Be sure to use either a closed-end wrench, or preferably, a Flare Nut wrench to avoid rounding off the Hex. An open-end wrench, grasping the Hex on only 2 sides, won't usually give you enough bite to loosen it properly without rounding it. A closed-end will grip on all 6 sides, but is cumbersome to use, especially when you have a drain tube fitted to the nipple. A Flare Nut wrench has one open side so you get a 5-sided grip. This way, it can pass past the drain tube, yet still give enough grip to avoid rounding off the Hex. Hope this helps...
Happy Motoring!... Jim'99
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