BMW part number 34311163464 is a Brake Master Cylinder Reservoir Plug/Grommet. This rubber grommet sits directly between the metal brake master cylinder body and the plastic fluid expansion reservoir tank to provide an airtight, leak-proof seal. Because BMW utilized a standardized master cylinder port sizing across multiple platforms, its vehicle compatibility list spans a massive array of models from 1984 through 2019. These are sold individually, but two (2) identical grommets are required per vehicle to fully service a dual-bore master cylinder assembly.
These are designed specifically for Girling (and Lucas-Girling / TRW) master cylinders. If your car is equipped with a Girling master cylinder, you'll need these grommets. The standard ATE grommets will not fit. ATE grommets feature slightly different inner/outer stepped diameters. Trying to force an ATE grommet into a Girling cylinder body will prevent the plastic fluid reservoir from seating completely down, resulting in immediate or slow fluid weeping.
BMW 5 Series
- 1984–1985 E28 Generation: 524td
- 1989–1995 E34 Generation: 525i, 530i, 535i, 540i, M5
- 1997–2003 E39 Generation: 525i, 528i, 530i, 540i, M5
- 2004–2010 E60 / E61 Generation: 525i, 525xi, 528i, 528xi, 530i, 530xi, 535i, 535xi, 545i, 550i, M5
- 2010–2017 F07 / F10 / F11 Generation: 528i, 535i, 550i, ActiveHybrid 5 (Pre-LCI & select LCI configurations)
BMW 6 Series
- 2004–2010 E63 / E64 Generation: 645Ci, 650i, M6
- 2012–2019 F06 / F12 / F13 Generation: 640i, 650i, M6, Alpina B6 (Including Coupe, Convertible, and Gran Coupe variants)
BMW 7 Series
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