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    Necessity of the mod = SVS fix(wiring mod option B) "graphic" explanation

    Thanks again. That makes sense and it also probably explains why (rarely) people still get the svs fault after doing the electrical mod if they had fluid leak and didn’t fix that too. Cheers guys.
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    Shuttle valve electrical fault disco 2

    That makes complete sense now! Thanks.
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    Shuttle valve electrical fault disco 2

    What does this mod actually do? Does it bypass the switch completely or just a function within the switch? From what I can see, the SVS tells SLABS when to switch from normal braking to ABS or HDC and open up the necessary solenoids and pump(s). Just curious!