ABS - Modified Rear Axle Speed Sensor
REF.NO. 35/51, 42/101TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS
DATE: November 1986
SUBJECT:
MODIFIED REAR AXLE SPEED SENSOR ALL 1986 MODELS
FIGURE 1 - SPEED SENSOR WITH STEEL FLANGE:
As of March 1986, a modified rear axle ABS speed sensor was gradually phased into production on models 124 and 201, similar to the sensor installed on models 107 and 126 since September 1985 production (Figure 1).
FIGURE 2 - DISTANCE BETWEEN SENSOR MOUNTING HOLE IN REAR AXLE HOUSING:
The modified speed sensor is recognized by its steel flange, previously a plastic flange. The mounting hole in the steel flange and in the rear axle housing has been moved due to the larger sensor head (Figure 2).
As a result, there are now two versions of the rear axle housings.
FIGURE 1 - SPEED SENSOR WITH STEEL FLANGE:
A = Model 126 B = Model 107 C = Model 124 D = Model 201 E = Model 201.034
FIGURE 2 - DISTANCE BETWEEN SENSOR MOUNTING HOLE IN REAR AXLE HOUSING:
Previous version a = 13.0 mm b = 2.8 mm Modified version a = 15.7 mm b = 5.5 mm
Note:
Re: Rear axle housing replacement: At the time of printing, the part number for the modified rear axle housing on models 124 and 201 has not yet been changed. However, the part number will be changed shortly. Therefore, prior to installation of a new rear axle housing, it is necessary to measure the distance between the mounting holes (Figure 2), in order to ensure that the proper housing is selected. If it is not possible to select a new rear axle housing with the same dimensions as the old housing, then the sensor must also be replaced.
Due to the size difference, the previous and modified speed sensors are not interchangeable.
Parts Information
Model Part Name Part Number
107 Speed sensor 107 540 04 17
124 Speed sensor 124 540 04 17
126 Speed sensor 126 540 13 17
201 Speed sensor 201 540 09 17
201.034 Speed sensor 201 540 10 17