If the brakes are spongy, there is still air in the lines. Are you sure that you are using the correct technique to bleed the brakes as it is generally a very simple job to get all the air out.
SOURCE: 92 dodge van rear ABS-brake and ABS lights on/can't reset?
Its probably how your bleeding your brakes, but first make sure the bleeding nipples are facing upward. You should bleed diagonaly, front pass wheel then rear driver wheel. Then front driver wheel and rear pass wheel. The abs light has its own computer your have to get it scanned to clear the codes and turn off the light
SOURCE: Replaced Master Cylinder and Brake Booster on 03
Did you replace the master cylinder and booster because of this? If so then did this problem follow any maintenance done on the brakes? Was there any leaks prior to the replaced parts?
The pedal dropping to the floor with no leaks would point to items you have already replaced or air in the brake lines. Normally though this follows a break job.
It could be that you had a bad master or booster and the brakes were not properly bled after their replacement. This could seem like the same problem but with different sources.
This may seem obvious to some to bleed the system after any work but even if you did this already you should do it again. Bleeding air from the master all the way to the rear cylinders takes quite a bit of time.
Hope this helps but if not please let me know the answers to the questions at the top.
SOURCE: I replaced the master cylinder, and still have no
sounds like you still have air in the system
SOURCE: I bought a 1999 oldsmobile silhouette replaced
If the brakes are spongy you will have to bleed the brakes again. It sounds like there is still air in them.
If you are doing it manualy make sure that the pedal is held down until the bleed screw is tight.
There is a brake bleeding kit that can be bought, this makes the job a lot easier.
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