My new to me 2017 M3W has some leak from the brake fluid reservoir.

At the beginning I thought it is because the reservoir was over-filled. I took some of the brake fluid out and the level is now below the max mark. I also tightened the hose clamps but it still leaks.

It appears the leak is coming at the cap area. I checked the cap and it appear ok and well tightened with healthy looking rubber seal.

Any suggestions please?


I am not sure if this is of any help but the red brake warning light comes for a a few seconds when doing "hard" right-hand cornering (and fast driving in roundabouts), This red warning brake light does not come on left-hand cornering).

Thank you

Ahmed


M3W: 2017 green
Caterham: 2003 yellow
Evora 400: 2016 black
SL500: 2005 blue
HD Breakout: 2020 red