T-cut is right, sort of, DOT5 is a poor lubricant compared to DOT4 and ABS pumps don't like this. There is a DOT5(PAG) spec which helps with this.
Thing is I can't really see the point of DOT5. It's main claims to fame are higher boiling point and non-hydroscopic, perfect for performance/racing brakes...BUT...any water it contains tends to pool as it is not absorbed. It is also more compressible than DOT4. Both of those are great reasons NOT to use it in a performance brake system.
For road cars it needs a re-designed system and is non-abs friendly, so not a great choice there either....so what is it for?
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