Brakes

Does anyone know why the brake pedal does not get very stiff when you back hard. The pedal almost bottoms out. You stop just not very quick. Just put disc brake conversion on the rear and bleed the brake system twice. The conversion is on a 1997 chevy 3500 with a 7.4 liter..

What type of booster do you have? Hydro or Vacuum?

Hydro,power bleed them and they better