spongy spider brakes

[Alan Lambert <gerard@domain.elided>]

My '74 brakes have become spongy.  Particulars:

Car still stops very well.

Tried a complete replacement of brake fluid using vaccuum bleeder--made 
no difference.

Pads are in good shape. 

Master cylinder is about 1 1/2 years old.

The spongyness is no different with or without the engine running.

The brakes do not pump up (ie no air in lines).

After enough pedal pressure to slow the car is applied, the pedal can 
still be depressed another 2" or so. (gets way below the gas pedal.)

I'm stumped--so is a mechanic friend.

PS--nobody lives in Anaheim?

================================================================================
Regards,
Alan G. Lambert___________________________________<gerard@domain.elided>
           *******Los Altos, California (office)*******

------------------------------