A Braking System Fault appears due to low level of brake fluid DOT 4 in Renault Megane 3 2011 model.
i Refill the brake fluid but errors again comes after 50 km drive.
i get it checked and it appears that Rear right wheel brake Caliper has a leakage and brake fluid is all around there.
i replaced the brake caliper part with new Brake Caliper for 50 Euros. errors goes away and everything working good.