Brake failure
 

We bought a 1999 Silhouette a few months ago and last week when driving , my brake pedal went to the floor when driving.
i managed to get it home and assumed it was a master cylinder issue as there are no warning lights on. It has brake fluid and new pads and rear drums. Everything was normal to that point.
when I look under the hood I see that the ABS is mounted on the side of the master cylinder with little room to work.
Is the a job I can do at hone or ?
any help would be very much apprecit

thank you