depends if u have a airtrap, res, t-split, or nothing.....air trap systems blead thenselfs......res systems are way easier to fill but harder to bleed if the res isnt the highest part of the system......t-split line is kinda a res/airtrap, cause u can fill and bleed from there.......and nothing (system with no bleeding or filling extras) isnt all that hard u just have to do it outside the system......most people test their systems outside their case so there no chance of screwing up expensive hardware from one lil leak....
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