adjusting the brake lever to the airbrake unit? mercedes 814D 1997?

Hi, I took apart the brake calipers on my mercedes 814D 1997.
It has an aircontrolled handbrake with a lever on the brake calipers. When i took off the brakecalipers with the old brakepads the lever on the brakecaliper would fit ... Now with new brakepads in the brakcalipers i miss around 35-40 mm to connect the lever on the brakecaliper to connect to the arm of the air unit. pistons on the caliper already maximal turned back inside. I assume I have to adjust somewhere else ?

hope to get some help. grt from the netherlands