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Sorry to jump in here but I felt it was urgent to mention that brake fluid contains ETHYLENE GLYCOL!
I am a vet and I have personally treated cats with this poisoning. It is highly toxic! If a cat were to walk through a puddle of ethylene glycol (in antifreeze) and then lick his paws this would be sufficient to kill him. It destroys the kidneys.
You need to take your cat to a vet immediately so they can make the cat vomit. There is an antidote but it must be administered within 6 hours of ingestion to be effective.
Here is more information:
I sincerely XXXXX XXXXX your cat did not lick any off her fur but it is SO toxic that I am very worried about her.
How is she doing? How long ago did the splash happen?