Brake Booster?

i need a brake booster for my 86 535i. I already puy one in it and it blew out im hoping it wont be ongoing becuase they arent cheap. any information involving a booster from a part out or anything helpful let me know.

Have you looked at the O-ring replacement procedure? It costs a whopping $3.00! This is the reason that they leak between the master cylinder and the booster.

Hydraulic Booster O Ring Replacement

Good Luck!