Since I don't know of a way to tell when the 18 hour cooldown on the Brewfest Ram Racing quest is active, I made this small program. It doesn't inject anything, just reads memory. Just run it after you've logged into your character and it will display the time remaining & date of when you can do the quest again.
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Download:
WoW_Ram_Racing_Time_Checker.exe
Download:
Filebeam - Beam up that File Scottie!
I haven't tested it extensively yet so let me know if it works for you.