Blowing brake fluid out of reservoir

SuperPete said:

Any one got any ideas what is cause or how to fix? The system seems to be pressuring up and emptying the fluid via the reservoir cap vent. Brakes work fine. After a while, low brake fluid warning light illuminates. Dealership told me they would have to replace the WABCO brake booster module as it is a none repairable fault at a cost of 2500 UK pounds plus labour!

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