I have a 1978 which had the same problem. I ended up replacing the disterbution valve connecting the master cylinderto the front and back brake lines. Now I have plenty of pressure and no soft peddle.
Aug 23, 2010 Rating
I have no brake pressure on my 1977 corvette. I have changed the master cylinder still no pressure? by: Strodder
Answer to I have no brake pressure on my 1977 corvette. I have changed the master cylinder still no pressure?:
Make sure you have free play from the brake pedal rod and the master cylinder.