Johnnygirl

O.K. I've replaced just about everthing now when it comes to brakes on my '98 A6 Quattro and I still don't have them!! Had a problem with mushy brakes after replacing a broken caliper last year. Replaced all four rotors, & brakes at the same time. Had the brakes pressure bled. Still mushy. One import mechanic suggested a new master cylinder-O.K. I don't have time to work on it-he puts it on. Absolutely no brakes then. Well, he says the pump might be bad because there's some fluid laying on top and in the "dimple" on top. I ordered a rebuilt one and put it on myself since he wanted around $800 to try that after he put a master cylinder on it for $400. Bled the brakes myself and had very good brakes until the next week when I had to stop hard. Mushy brakes again. Fluid on top of the new pump again. At this point, I doubt my abilities and the guy I had taken it to in the first place and I take it to a "highly recommended" Import Auto mechanic. He looks it over and says that the first guy put the wrong master cylinder on it and I give him the O.K. to put another on. $300 more. Brakes work fine for two days. Go to stop hard-pedal goes to floor, mushy brakes, fluid on top of pump. I'm driving a reconstructed '95 F-150 with 160,000 miles on it back and forth to school because my German ride doesn't have brakes. I asked for matches because I'm not sinking another dime into the thing unless I have some idea of what's going on. I'd rather rather drink beer and roast weenies over it's burning carcass first!!

/dev/audi/

Did you use Vag com to purge the ABS pump? If you replace the ABS pump you need to use a Vag-com to cycle the ABS pump to purge the air.

A hard stop could active the ABS pump and draw air further into the pump and cause problems.