If you found three electrical connection, one of the was the ABS sensor.
The picture shows the loaction of the right ABS sensor. The other two connection you found were on the back side, bolted to the caliper and belong to the brake wear sensors.
The idler arm. Well, the arm coming off the steering box is the pitman arm, the idler arm mirrors the pitman arm, only located on the passenger side. Find the pitman arm and follow the drag link to the other side, and there you'll find the idler arm. Hope that's not oversimplified.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.