Full Fury + Build Up + Alotta Reds + Buffs at lev 39 gave 1200ish.
Well, that's pretty close to maximum I think, brute damage cap is around 800%, and ET is the highest damage brute attack.
I'm pretty sure I hit maximum....I did use about a tray of reds (oh and 2 accs)
I'm a DM Brute, so I havn't done any significantly high damage in an attack 
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I think I've topped 500 before a couple of times. To behonest I dont tend to watch the numbers after Breath Of Fire cause I'm too busy looking at the partical physics and grinning to read the numbers
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
As a Granite Brute, it's not about the big numbers...it's about getting everything hitting you 
With the - Damage on Granite, it's only Fulcrum that helps...however a fulcrum shifted Fire Sword Circle is a thing of beauty....hitting 10 mobs for a good few hundred each is awesome hehe
(also agro's like hell!)
I think my biggest hits may have been with Fire Sword Circle, full fury and heavily debuffed foes (with FS too obviously) Thats the power I think I've topped the 500 with, I dont check the combat tab and everything was dead
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
1538 damage with Knockout Blow on a Blaster resting in Siren's Call. Keep in mind you are examp'd to lvl 30 in the zone. I couldn't believe it. I know you get huge bonus damage on targets who are in "resting" status though.
full table of reds 5 buffs, build up and full rage... 1250 damage (this was on the RV test server thing) (i got the insps by going out of rv for a sec) :S
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1538 damage with Knockout Blow on a Blaster resting in Siren's Call. Keep in mind you are examp'd to lvl 30 in the zone. I couldn't believe it. I know you get huge bonus damage on targets who are in "resting" status though.
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Bwhahahah... silly Blaster 
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I'm pretty sure I hit maximum....I did use about a tray of reds (oh and 2 accs)
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Did you slot your attacks with damage SOs, that counta too.
All ++'s
think my best unbuffed (no insps, no fulcrum, no anything) was at 30ish, fury at 75%, seismic smash on a rikti drone gave bout 600 dmg. My best buffed attack.. well.. I dont really pay attention to the numbers as I like the "SMASH!SMASH!SMASH!" feeling 
"god, how many devs did hami have to sleep with to get ED?"
Total Cat @Stagefright
I'm guessing that team mates where debuffing res cus I havent got anywhere near that level again.
i was just wondering how much damage you have done as a brute under any given circumstances. personally, my moment was when i was running a 8 man relentless mission with my lvl 40 EM/SA brute. i remember running into a full purple mob with granite on to take all aggro and let my team pick off some. the kinetic in the team hit fulcrim shift which hit 7 to 10 enemies, i had full fury, hit build and did energy trasfer on boss which did 1000 damage plus
was a glorious moment indeed.
so, what were your experience like?