Passat B5 1998 1.8 SE.

Sudden braking at high speeds (60 mph +) cuases the steering wheel to vibrate.

This used to happen at all speeds, until the delaer repalced rear brakes, which helpd but didn't entirely solve the problem. The the fornt pads were replaced and that seemed to have solved iit, but now, some 2000 miles later, the problem is back, though it's intermittant. Also, there is a knockimng noise when the brakes are applied - this is expecially noticeable at slow speeds, say in traffic when jabbing the brakes.


Any ideas?