AF1

My 2005 A4 2.0T 6M may sit for up to 4 weeks at a time without being driven. I never had any issues until recently. Lately when I first go to use the car the brake pedal will go all the way to the floor with minimal stopping power. Repeated pumping of the pedal brings the pedal up some what. After a few low speed stops the brake system goes back to normal. The car will then perform as advertised until it sits for that extended period of time. Any thoughts.

groundpounder

Ck the brake fluid level, maybe needs brake bleeding, could also be a brake boost vac leak, just a few ideas to ck anymore i'm sure would be welcome. Charles

rdA4WtQ5

Sure seems like a brake master cylinder due for retirement to me.