get a bungie and deploy it on the rear pedal so as to keep the brake engaged fully as possible. Leave this on for 24 hours. This will force any trapped air up to the resevoir, er resavoir, errrr res... ah you know what I mean. Then remove the bungie and top off the fluid. If this does not help enough, do it again. If the brake lines and all the parts are good, this will fix it.
