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Hi guys, my PAS pump has started pissing everywhere. New pump is quite expensive. I know seal kit can be bought from Audi, so that would be one solution.
What PN pump I have to use if I convert brakes to vacuum servo and get rid of the complicated system it has now?
'93 Audi 100 Avant - R.I.P
'92 Audi UrS4 Avant - SOLD
'93 Audi UrS4 Avant
'15 Audi A7 quattro 3.0 TDI
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RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
See Dave, that was my first idea too, but top of the pump is dry, no sign of fluid.
Then it is most likely that the leakage is from the high pressure "J" hose from the PS/PB pump to the steering rack. PN 4A1422893Q (lhd) maybe 4A2422893M (rhd).
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The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums
Item 12 (maybe 13 for rhd)
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
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mine costs £350 new 
I'll order X-Plug and get that changed then 
thanks guys.
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