It sounds like you have air in the brake lines. Air will compress when the brakes are applied, liquid such as brake fluid will not.
Also, check all the hoses that are in the system, such as the ones going to your front brakes. Sometimes they will rupture internally and allow the hose to bulge but will not leak when the brakes are applied.
If you are not losing any brake fluid, then I would bet on air still in the lines.
Ron
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