i donno.

i believe brake fluid has less compressibility, so that it suitable for transfering braking force,
while coolant fluid has lower specific heat, so that it can absorb heat from engine block fast & dissipate thru radiator fast.

fast search from the net shows both are glycol compound.
brake fluid: http://en.wikipedia.org/wiki/DOT_4
coolant: http://en.wikipedia.org/wiki/Propylene_glycol

"crude" compariosn of both glycols:
http://www.engineeringtoolbox.com/ethylene...ycol-d_904.html

may be we should look at viscosity (nipis/tebal) & corrosion properties?

wei...top up only what? not the whole bottle?

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aiyyaa...i study the wrong fluid...sorry guys

This post has been edited by farghmee: Feb 15 2013, 12:32 PM