ABS Pump running whenever I press the brake? Any ideas?

[Karl-g]

Hi all,

I have recently noticed my ABS pump kicking in every time i press the brake pedal, I am also getting fault code P0172 (system too rich)

Could this be due to a vacuum leak near the brake servo, causing the pump to compensate a lack of vacuum?

Grabbing a straws here before I take a trip to the stealers!

Has anyone had a similar problem?

Any advise would be great.

Karl