Last week the low brake fluid warning light started flashing, I checked and sure enough about 100ml was missing. I got down and dirty to look for leaking at the brake callipers but all was dry. Bone dry. When poking around the engine bay I spot the union of the brake cylinder vacuum pipe is loose at the engine end. I tighten it and top up the fluid.

Drive around for two days - no light, but when I pop the hood, the level has dropped again. Top up with about 60 ml of DOT 4, drive around town for a while and check. Its fallen again. I check the callipers and brake lines generally. Can't see any damp.

So whats the problem? Have I been topping up wrong causing a shortfall in the real level.

Should I have engine running and pump the brake pedal as I top up?

Or is the brake master on the way out?

Mike.

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1990 Euro 190e 2.0l Petrol Now Sold Maybe a w116 280se next