First toy appearance: 
late summer 2001

First Cartoon Appearance: TF:RID episode 1 Sept 8, 01

Additional Pics:  
Notice different headlights on Japanese version of this toy

X-Brawn loves extremes and is at best in disastrous situations and brutal climates, such as dry deserts or snow storms. He doesn't waste time on long-winded speeches and can be counted on to say it all in just a few words. He's very reliable and has fearsome strength. He is a martial arts master with an especially powerful left arm. His "Southpaw Lariat" is invincible.

Other appearances:  There was never another character in the Transformers Universe named "X-Brawn" but there was a macho trash-talkin' jeep/utility vehicle named "BRAWN."  One of the original Autobot "mini-bots."  Check out his stats by following the link above.

What would these characters have looked like in Beast Wars/Machines CGI?  This art from the japanese cards gives us a glimpse!  Ah, how sweet that would'a been!

not just the headlights...  even the taillights are different on the japanese version of this toy