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What I'll get after removing the spring and bearing - more pressure on rear break lines?
NO, its a valve designed to keep a small a mount of pressure on the rear cylinders of a drum brake system - so they don't have to move so much when you hit the brakes. If you leave the valve in when converting to rear disc brakes you will over heat and wear the pads out very quickly.
Ok. Thank you for your answers. And the last questions - how much mm. you've taken off from the axle shaft to take on it the break disk? Did you do anything with the parking brake cable? What is the length of new wheel bolts or I can use it from the old drum brakes (I think that wheel bolts must be longer then old drum wheel bolts).