The brakes on my 405 have always been a bit spongy and slowly got a bit worse over time until it became dangerous. Anyway, bled all the brakes and made no difference so assumed it was the master cyclinder.

Replaced that with a new one and beld all four lines again (using a pressure based Gunson Eezibleed), and still got spongy brakes.

Basically doesn't 'bite' and the pedal goes almost to the floor. Even then, with full effort braking is decidedly 'dodgy' to say the least.

Any thoughts?