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Re: Brake warning light - intermittent. Grand Scenic 2006/2.0 Dci
You have done the basic checks for a leak.
The loss of fluid in the braking system is VERY DANGEROUS, please get either a mobile mechanic or top it up & very carefully take car to a close garage for further investigation.
I suspect? the master cylinder is/has failed & the fluid is disappearing down the back where you cannot see it.
Currently in A55ii's garage:
Megane Sports Tourer 106 1.5 dci , Clio 1.2 16v & A55 mk ii