I thought this would be of use to someone so here goes.
After all the ordeal i had with the hydraulic system, i decided to switch to a vaccum assist servo on the rs2. This is a common conversion in the US, and here is the parts list.
brake booster (4a0 612 107A)
gasket for booster (431 612 193)
clevis (893 721 213)
clevis nut (n011 162 9)
clevis pin (443 721 371 A)
check valve (191 611 933 E)
You also may need the 3b power steering hose from the pump to the steering rack, as it seems to be the only one that fits the LHD cars, otherwise it shouldnt be a problem on RHD cars at all with the hose already there.
Next is the modification on the power steering pump itself, by removal of the springs and pistons that lie under the x2 marked plugs with the big cross, or X (depends the way you look at it!!)
In addition, you need to modify the steering rack return hose, which is a simple return, no high pressure one, as well as there is a need of either a T joint or an additional hole to the Inlet manifold to get the vaccum from to the servo.
Finally, the 2 cables on the hydraulic servo that are meant to measure the pressure in the system and light up the dash, can be left out, covered with tape or heat shrink, but do not hotwire them, as the alarm stays permanently ON.
I enclose a small pdf description of the modification on an S4
Hope it helps!
Vasilis
After all the ordeal i had with the hydraulic system, i decided to switch to a vaccum assist servo on the rs2. This is a common conversion in the US, and here is the parts list.
brake booster (4a0 612 107A)
gasket for booster (431 612 193)
clevis (893 721 213)
clevis nut (n011 162 9)
clevis pin (443 721 371 A)
check valve (191 611 933 E)
You also may need the 3b power steering hose from the pump to the steering rack, as it seems to be the only one that fits the LHD cars, otherwise it shouldnt be a problem on RHD cars at all with the hose already there.
Next is the modification on the power steering pump itself, by removal of the springs and pistons that lie under the x2 marked plugs with the big cross, or X (depends the way you look at it!!)
In addition, you need to modify the steering rack return hose, which is a simple return, no high pressure one, as well as there is a need of either a T joint or an additional hole to the Inlet manifold to get the vaccum from to the servo.
Finally, the 2 cables on the hydraulic servo that are meant to measure the pressure in the system and light up the dash, can be left out, covered with tape or heat shrink, but do not hotwire them, as the alarm stays permanently ON.
I enclose a small pdf description of the modification on an S4
Hope it helps!
Vasilis
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