You dont mention any details about the vehicle, but could be the abs module.
Check if the brake cylinders leak, pads would absolve brake fluid and cause such problems. The brake cylinder, pads, and related parts would show a wet look as opposed to looking dry. Dry means not leaking.
The proportioning valve is another possibility. Bleeding the brakes would show different bleeding reaction between fronts and rears. Gush or ooze.
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