V40 d2 2013.
 

Hi please help....
My beloved V40 has over the past month had an intermittent message on the dash ' Brake system service required. The discs and pads were replaced 4month ago along with brake fluid. The pedal has felt fine until today. While under slight braking the pedal feels spongy with a slight grating feel, there is no sign of leaks etc....
Help would be much appreciated.
Many thanks