I have a 91 w250 and I am having brake problems. the pedal goes to the floor and I have to pump em up to get good stopping power this has been happening for a while now, first i tried changing out the master cylinder and it was somewhat better for a while but it just got worse and worse untill it was to the same point, so i then changed the brake booster and the same thing happened. It seems like ive bled a bazzilion gallons of brake fluid through them and have not seen any improvement. what should I try?

 

Oh yeah and everthing is stock.

 

Welcome to the site!...Fill out your signature so that we know what you have. Next, your symptoms are common, if you search your thread title, it will probably return 50 pages of threads. It sounds like the master cylinder is bad. The rebuilds are notoriously bad, especially the boosters. Read a few and you will start finding solutions, in the mean time, good luck...Mark