GU17659350 , 34 31 1 237 233 Genuine OEM 15mm Brembo PS15 master cylinder repair kit. Fits rear master cylinders on all integrated system disk brake big twin models from 1976 through 2010, as well as early small twins. And original front round reservoir master cylinder on disk Eldorado, disk V7 Sport, 750S and 850T. Actual major piston diameter 15.84mm. Does not fit rectangular reservoir 15mm master cylinders. Brembo number 110273920
Front master cylinder disk Eldorado, disk V7 Sport, 750S and 850T.
Rear master cylinder 850T3, S3, T4, T5, Convert, G5, SP1000, SP II, SP III, Strada, 850 Lemans Lemans II, CX100, LeMans III, LeMans1000 all years LeMans IV and LeMans V, 1000S, Mille, V35, V50, V50 II, V50 III, Monza, V65C, V65SP, V65TT, California II, California III, California 1100, EV, EV Touring, Jackal, Bassa, California Special, Special Sport, California Stone, Stone Touring, Aluminum, Titanium, Stone Metal, Black Eagle, California Vintage
The order of installation for spring and seal assembly is shown in the image.
Also fitting multiple Ducati, Laverda, and Benelli motorcycles of the 1970s and 1980s. Ducati number 066139790.
Also fitting BMW 15mm rear master cylinders from 1976 until mid year 1980 under BMW part number 34 31 1 237 233. 1976 to mid '80 R100RS, 1978 to mid '80 R100RT, 1976 to mid '80 R100S.