Notes on installing brake pad wear sensor contact sensors - AH42.10-P-0003-01A

The following variants exist on the front axle:

One contact sensor, two contact sensors or four contact sensors.

The following variants exist at the rear axle:

No contact sensor, one contact sensor, two contact sensors or four contact sensors.

Vehicles with ETS, ESP or ASR have contact sensors for the brake lining wear indicator.

The contact sensor line must be routed as shown in the picture. Only transparent (temperature-resistant) contact sensors must be installed at the rear axle.

When changing the brake pads as many contact sensors should be installed in the same position as were present.

If only one contact sensor is installed on a brake caliper, then this is to be fitted again to the same brake pad and in the same position.

As a result of moisture, unconnected contact sensors cause the brake pad wear warning lamp to illuminate.

MODEL 129

Fig 1: Identifying Right Rear Brake Contact Sensor

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Contact sensor location (not for model 163 and model 690.6)

For reasons of replacement parts simplification, the brake linings must be installed so that the contact sensors can be installed in the corresponding installation position.

The corresponding installation of the contact sensors can be obtained from the tables below.

Fig 2: Locating Contact Sensors

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Model 211	Version	Front axle						Rear axle
Model 211	Version	1	2	3	4	5	6	7	8	9	10
up to 10/02	all		•				•			•
down 11/02	except E50, DE40LA		•				•			•
down 11/02	E50, DE40LA			•			•			•
as of MY 05	all						•			•

Model 216	Version	Front axle				Rear axle
Model 216	Version	1	4	5	6	7	8	9	10
	Type 216.371				•			•
	Type 216.376			•				•
	Type 216.377			•				•