Typically, the abs sensor gets small metalic particles in the slotted probe. Where do these small metalic particles come from? The Semi metalic brake pads. Cleaning them involves removing the caliper and pads and the hub and rotor. There is a 'tone' wheel on the hub that also gets metalic particles in between the slots.

Here's a link to the W126 service manual.

http://mb.braingears.com/126_DISC2/program/matrix.htm

http://mb.braingears.com/126_DISC2/program/chassis_420SEL.htm

__________________
Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.