Going back to the DOT 5 issue - don't use it!
The usual stuff is DOT 4 and is good enough. BUT it absorbs water and goes off with time - hence the need to replace it.
DOT 5 does not absorb water and does not go off BIG BUT water then collects in the lowest part of the system - ie the caliper - this causes not only corrosion, but also has a tendency to boil if you brake REALLY hard - that then introduces a compressible gas in your system and your brakes fail
DOT 5.1 gets round the problem associated with DOT 5 and is just like DOT 4 but operates at a higher temperature. You will not get an SV to a high enough performance to require the increased temperature resistance. (Besides DOT 5.1 is really expensive by comparison)
So, DOT 4 is OK for the vast majority of road bikes, DOT 5 tends to be used by rich race teams who can afford to replace their fluid every weekend, DOT 5.1 tends to be used by high performance bikes.
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