ABS valve noise

[goddo]

Hi, I am newcomer to this section of PistonHeads, so be gentle with me!
My daughter owns a 2009 Mini One that has developed a strange "sighing" noise when the brakes are applied.
Our local garage has inspected the car and confirmed that the tyres, brakes and suspension are all OK and their
diagnosis is a valve in the ABS system is a bit lazy, creating a "sigh or light groaning" noise. The brakes appear to be
performing correctly at the moment and they say that there is no danger of the valve failing.
Has anyone on here had experience of this and is there a repair remedy?
I know the only full answer is a replacement ABS system

[goddo]

More noticeable when car is cold the noise occurs when pressing the brake pedal and you are just about to come to a standstill.
Probably over the last four or five metres I would say.
At higher speeds and just "dabbing" the brake pedal I cannot hear the noise but that could be to do with normal road and traffic noises around.
As I say, everything seems to be working OK and the garage confirm there is no problem with tyres, pads, discs or steering mechanism.

[goddo]

Thanks for that advice. I will relay it to the garage and see what they say.