On a CRG 08 the brake is self adjusting. As Walt said make sure you have good brake pads with only slight clearance.
Next step is to bleed the brakes with fresh fluid. When you bleed the brakes, make sure the lever on the master cylinder is ALL the way back against the MC. I use a MightyVac attached to the bleed nipple with fuel line, and suck the fluid through the system, make sure the top is off the MC, and keep filling it as needed. When happy, put it all back together.
Now you want to adjust you brake pedal. Keep shortening/lengthening the brake rod until the pedal is in the right location for the driver, BUT the lever on the MC should ALWAYS be up against the MC when brake is at rest.