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Description

Brake Reservoir O-ring 18 X 21

Hard to find O-ring (it is not available from BMW) between the brake fluid reservoir and the brake master cylinder under the tank of BMW Airheads after to 09/75. The o-ring is specifically designed to be brake fluid resistant to provide the user a long and durable life-time.

O-ring for between brake fluid reservoir and master cylinder, R75/6 - R100RT. This fits the one-hole reservoir 1976-1980 (and possibly 1975 ). Measures 18mm ID x 1.5mm thick ( 21mm OD).

Equivalent to BMW part # 34 31 1 234 707 ( 34311234707 )

NOTES:

This is is the for the later-version of the master cylinder (one whole reservoir), measure to make sure your master cylinder if uncertain
Prior to 09/75 the o-rings needed for the reservoir to be properly sealed =12x16 and 6x10 (see Related Products)