This is our brake booster service kit for all vehicles that use the brake booster with the part # 34 33 11 56 925 or part # 34 33 11 61 772. Our kit fits the following vehicles:
Fitment for Part # 34 33 11 56 925:
E28 5 series from 09/1980 to 12/1987: 525i, 528i, 533i, 535i, M535i, M5
E24 6 series from 09/1977 to 04/1989: 628CSi, 633CSi, 635CSi, M635CSi, M6
E32 7 series from 10/1985 to 03/1994: 730i, 730iL, 735i, 735iL, 750iL
Fitment for Part # 34 33 11 61 772:
E32 7 series from 11/1986 to 03/1994: 750i, 750iL, 750iLS
E31 8 series from 07/1989 to 10/1996: 850i, 850Ci, 850CSi
Generally speaking, this brake booster is used in BMW's powered by a M30 or M70 engine.
The brake booster has a plastic reduction cup that is prone to leaking hydraulic oil and this part is not available individually from BMW. Same problem applies to O-rings on the brake booster. So we decided to produce our own reduction cup which is made out of aluminum. The aluminum reduction cup is offered with all the O-rings needed, making this the complete service kit for the brake booster.
This kit was installed and tested on several cars with no issues.
Note: Only the aluminum reduction cup and rubber O-rings are part of this kit. Not the brake booster or anything else.
