I have air in my abs pump as well. I tried the bleeding tip posted above and it made it better. However I still get the noise for about 2 seconds when I start up the car. My ABS light pretty much stays on the whole time i'm driving.
While the sound isn't so bad the light is annoying. When I bleed it now I get no air coming out but the noise is still there.
Does any one have tips on completely eliminating this problem? I have a 95 LS btw.