Driving home from work yesterday I braked while approaching a corner and felt like the brakes weren't doing their job as well as usual! Also noticed that handbrake wasn't working as well at traffic lights, and the car started to roll back despite me applying standard handbrake position.

Continued to drive and found that brake pedal travel had increased, but was fixed with a pump or two.

It continued as a sequence like this for the last couple of miles of my journey.

Brake fluid is just under max on the reservoir, can't see any leaks from the hoses or calipers or under the car.

Could water have gotten into the fluid somehow?

Not seeing any warning lights on the dash as I did when my rear pads were low.

Project Mu front calipers and discs with braided hoses, standard Rev 3 brakes on the rear.
