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Re: Megane III Brakes Problem
Old brake fluid can lead to spongy brakes. Especially if the brakes are being used hard.
Getting air into system.
Has to be a leak somewhere.
Usually a visual inspection will identify if a pipe or fitting. Give flexible pipes a really good look as the covering and dirt can obscure a minor leak.
Suspect any solid pipes that look bulged even if not wet.
Otherwise it's caliper seals or master cylinder.
If a decent leak it is usually shown by wet around the piston.
If, as in the OP, it always seems to be one caliper that needs bleeding, that has to be suspect even if no outward signs of a leak.
Currently in Dancingdad's garage:
Qashqai 1.6 spark driven, Kia Sedona 2.9 TDI, Scenic II 15DCi 2004 (SORN) not quite RIP.