My 98 Beetle has terrible brakes. They are terrifying. The pads and rotors themselves are in great condition, I just had the master cylinder and brake booster replaced because it was leaking, I thought that would help and it only made it worse. My brakes now go all the way to the floor before applying. I was told maybe the vacuum pump? The outlet on the vacuum pump was very very loose so I sealed it with some JB weld and that’s doesn’t seem to have helped at all. Do these vacuum pumps fail internally? How would I test that?