Repair kit, hydraulic unit ASC — a genuine BMW part, number 34 51 1 165 052. The number stamped on the part is 34511165052; BMW's catalog files it under the short number 1165052. You will find it on our Brakes shelf, under Mechanical-hydraulic components.
It fits the E36 coupe, convertible, touring and compact (318i and 318ti, 1992–1999), with the M43 or M44 engines — and the European-market versions. It also fits every E46 body style (320i, 323i, 325i, 328i and 330i, 1999–2006), with the M52 or M54 engines — and the European-market versions.
BMW draws it on 4 diagrams, among them ASC hydro unit/control unit/support (34_0763) and ASC hydro unit/control unit/support (34_0902). It weighs about 2.5 kg (5.5 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.