First determine if the brakes are a wee bit tight without the engine running/ vacuum to the booster... If they are still tight the booster push rod is not the problem. Still tight with the engine running, pull the master off just slightly and turn the rod in a bit 1/4 to 1/2 turn and repeat, until the problem is fixed. There is normally enough room that you do not need to remove the brake lines and re-bleed.
