A method for ensuring a braking effect utilizes a service brake system and a parking brake system of a vehicle. The system further includes a detector detecting light, and a mirrored assembly having together with the detector an axis of symmetry about a line perpendicular to the wafer surface. The method includes moving a support leg to a non-supporting position when the dock leveler ramp is engaged with a vehicle, and moving the support to a supporting position if the dock leveler ramp descends too quickly. The control logic is configured to receive various status signals from the service processor and to generate a control signal based thereon.