Originally posted by Error404
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Hydraulic to Vaccum servo conversion
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For reference Forge are now making a billet one way valve specifically for high boosting cars with vacuum brakes:-
http://www.ebay.co.uk/itm/331470792631sigpic
1991 Audi S2 3B - 2.5 Stroker engine
1997 A6 2.5TDi quattro avant - C4
1976 RD250E / 350LC cafe racer
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I'll add something from me. I converted hydro assist to C6 master cylinder, 8" booster and electric vacuum pump, exactly as in C6.
Sorry for Polish marking on pics, they were made for use on PL forums .
For control of electric pump was built control unit using old map sensor taken out of Motronic ECU .
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Because the hole in the bulkhead is bigger on the C4 than B3/B4 chassis. The later dual diaphragm servo from the C6/D3 does not fit the smaller B3/B4 chassis without some modifications. You need to cut the bulkhead & modify the pedal box.Panthero Coupé quattro 20vt
Indigo ABY coupé
Imola B6 S4 Avant
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I see . There's no such issue in C4 chassis. Only problem with dual diaphragm servo U need to solve is brake pedal rod. In C6/D3 we get ball joint, U need to cut it some longer piece of rod, make new M8 thread and use C4's original "fork" joint.
I did not said the mod was easy but certainly was worth it.
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Hi Guys,
sometime last year i fitted the a8 d2 brake booster and master brake cylinder in my 7A quattro coupe and i thought it might be interesting for one or the other...
7x8 inch brake booster combined with the 25,4mm master brake cylinder.
the other option would be the 26,9mm i guess. but that would be overkill.
adapter plate needs to be fabricated. otherwise the brake booster will be leaky.
a6 v6 hydraulic steering pump. quite the same pump used for a long time at audi.
a4 b5/b6 or B4 v6 is also the same. bolt on directly to the 7A bracket.
brake booster without grommet. you see these tubes coming out of the brake booster for the bolts.
the "tubes" are not the same level as the brake booster surface. thats the reason for the adapter plate i made.
adapter plate alignment.
difference between the hydraulic spacer (short one) and the vacuum spacer (long one).
adapter rod and the grommet mounted.
adapter plate, vacuum spacer, adapter rod and that kind of fork mounted.
this adapter needs to be fabricated to increase the rod length:
ready for installation:
Audi Coupé Quattro 20V
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