No brake fluid ,please.
Just hydraulic oil or oil from automatic hydraulic car gears gears.
AS

Oops, I stand corrected.

I would like to thank you for making a real quality product. Your fully
fumctional trailers make assembling and disassembling the glider a joy, not a
burden. Only those who have owned a dysfunctional trailers, can really
appreciate the Cobra.
Keep up the good work,
JJ Sinclair