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Brake warning light - intermittent. Grand Scenic 2006/2.0 Dci


The brake warning light on the dash comes on occasionally when turning sharply left or right and at a standstill. Grand Scenic 2, 2006/2.0 Dci / 150000 kms.
I checked the master reservoir and found the fluid level was low. I added about 1 deciliter and the braking system worked fine with no warning. One month on the warning light has come on again. The brake fluid reservoir is so far back and down into the bulkhead that it is very difficult to see the exact level.
I therefore can only suspect a leak somewhere but can't find any leaking brake oil !
Where is the most likely leak area or connection?
Any other ideas?
Brake pads/disks are fine.
Currently in Andyhv's garage:
Renault Grand Scenic. 2.0 dci. 2006
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