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Hi everyone from Australia!
I have a very strange problem that I’m hoping someone may be able to help me solve. I recently replaced both vacuum brake boosters on my RHD 528i with reconditioned ones and now I have a very strange problem.
After bleeding the system, now it appears as though the engine vacuum is holding the brakes fully on! With the engine running, the car is unable to move as the brakes are on, when you switch off the engine, you can hear the brakes releasing!
The check valve on the vacuum line to the brake boosters from the top of the engine has been checked and is working fine and in the correct orientation.
Has anyone ever experienced this problem? It’s very strange indeed as all that was done was the direct replacement of both brake boosters.
Any help or suggestions are appreciated as the brakes are locked on with the engine running and the car cannot be moved unless you really press the accelerator!
Thanks Scott.

You of course have that bizarre system over there that BMW put on RHD cars, but I'll take a stab. I bet it's being preloaded. That you need to adjust the link between the master cylinder linkage and the servo, that it thinks the brakes are being applied. Then again, looking at the Realoem pic with the little vacuum pods off the main servo, I'm not sure about anything. That's a really complicated system.