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Old 07-25-2011, 08:11 PM   #4
Woolf Barnato
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Joined: Jul 2004
Location: OAK
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Originally Posted by tbarstow View Post
There are 6 circuits, you missed two of them on the servo. Each one goes like this: master cylinder to servo, servo to servo, then servo to caliper.

Flushing and bleeding the middle circuit for both the front and rear circuits keeps your servo from dying.
Yes, the source of the fluid that issues forth from those six bleed nipples are the front and rear brake master cylinder reservoirs. BMW calls that the control circuit. They call the circuit that leads to the caliper the wheel circuit.
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