Genuine BMW part 34 33 1 181 297: Displacement sensor o-ring. The number stamped on the part is 34331181297; BMW's catalog files it under the short number 1181297. You will find it on our Brakes shelf, under Other Brakes parts.
It fits every E36 body style (318i, 318ti, 320i, 323i, 325i, 328i and M3, 1992–1999), with the M40, M42, M43, M44, M50 or M52 and other engines — and the European-market versions.
BMW draws it on 6 diagrams, among them Power brake unit depression (34_0385) and Power brake unit depression (34_0388). It weighs about 1 g (under 0.1 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.
