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1. It's not oil the best name is brake fluid as it consists a lot of material inside such as (silicone, glycol ether/borate ester, mineral oil)
2. One of the main things for BF, it must have a high boiling point to avoid vaporizing in the lines this is 
why we need to change the brake fluid from time to time as it has tendency to absorb water which will lower its boiling temperature leading to change part of the fluid into moisture and vapour inside the brake circuits and this will create vapour lock leading to being compressible and once it became compressible the brake foot force will not be transferred to the other brake parts (cylinders,brake pistons, ...) 
We have many types of BF each has its own dry/wet boiling temperature such as:-
DOT3 (dry 205C/401F- wet 140C/284F)
DOT4 (dry 230C/446F - wet 150C/311F)
DOT5 (dry 260C/500F - wet 180C/365F)
*Hygroscopic means (water absorbing)

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