Brake pedal to the floor

[denis]

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My 90 Audi (FWD) brake pedal gone to the floor. The little module attached =
to the rear swing arm was linky. I replace with one from my old 5000CD. But=
 the pedale still go to the floor with pooor brake. I have to pump again ev=
ery 30 sec the keep brake active. And there is NO brake fluide anywhere.

Can i repare the little aluminium module ? 4 brake line go to it.
Maybe the 5000CD module does not do the same job.

There is no air in the brake sysyem.

Why the brake pedale goes slowly to the floor when i use the brake ?  since=
 the little module go bad.

Denis