Check your fluid level (under instrument cluster cover) first.  If it is
full then your master cylinder is going bad and should be replaced
immediately.  Do not drive the van in this condition.  You are risking
your life and the lives of others.  Be safe.  If your fluid is low then
you have to find the leak.  Fill the fluid again and pump the brakes.
Now have a helper look under the van to see if there is anything
dripping or squirting.  If not then it is probably the rear wheel
cylinders which you can only see after you pull the rear drums.

We have German master cylinders and other brake components in stock.
Let me know if I can help you further.

Ken Wilford
John 3:16
www.vanagain.com

Slloth wrote:
> I'm pretty sure this isn't normal.  But I noticed today when I am at a
> stop and I have my foot resting on the brake pedal it slowly fades till
> the pedal hits the floor.  Is this caused by air in the lines?
>
> --
> '84 Westfalia, 1.9L
> '73 FJ40, 2F
>