ABS System Components For Front Axle

ABS system components for front axle, removing and installing

CAUTION! Before working on the brake system, read CAUTIONS and WARNINGS, Refer to Service Precautions.

Note: Removing and installing ABS system parts is identical for FS III and FN 3 brake calipers.





1 - ABS wheel speed sensor
^ Before inserting sensor, clean hole and coat with grease, Part No. G 000 650
2 - Wheel bearing housing
3 - Socket-head bolt
^ Tighten to 8 Nm (71 inch lbs.)
4 - Splash shield
5 - Bolt
^ Tighten to 10 Nm (7 ft. lbs.)
6 - Wheel bearing
^ Replace each time after removing
^ Removing and installing
Refer to Steering and Suspension
7 - Phillips screw
8 - Brake disc
9 - Wheel hub with ABS wheel speed sensor rotor
^ Removing and installing
Refer to Steering and Suspension.
10 - Circlip

ABS wheel speed sensor for front axle, removing and installing
Removing
^ Raise vehicle.





^ Disconnect connector for wheel speed sensor and speed sensor wiring -1-.
^ Remove bolt -2- from wheel bearing housing.
^ Remove ABS wheel speed sensor from wheel bearing housing.

Installing
^ Before inserting wheel speed sensor, clean hole and coat speed sensor with grease, Part No. G 000 650.
^ Insert wheel speed sensor into hole in wheel bearing housing and tighten bolt to 8 Nm (71 inch lbs.).
^ Connect wheel speed sensor to speed sensor wiring.
^ Turn wheels fully to left and right lock and check clearance of speed sensor wiring.

ABS wheel speed sensor gap, checking
^ Raise vehicle.
^ Remove wheel.
^ Rotate brake disc and check whether wheel speed sensor rotor is damaged or dirty.
^ If rotor is damaged, remove wheel hub with rotor and replace

Rotor runout, checking
^ Raise vehicle.
^ Remove wheel.





^ Turn wheel hub and measure distance between rotor and speed sensor, dimension -a- all around.
^ dimension -a- = 0.3 mm (0.0118 inch)
^ If rotor is not true, remove wheel hub with rotor and replace.

Front wheel speed sensor wiring, removing and installing
Required special tools





^ VAS 1978 wiring repair kit

Removing:
^ Obtain radio code on vehicles with coded radio.
^ Disconnect battery.





^ Pull off intake hose -1- and connector -2- from Mass Air Flow (MAF) sensor.
^ Remove bolts -4- and -5-.
^ Remove air cleaner unit.





^ Remove connector from ABS Control Module (arrow -1-) and pull off (arrow -2-).





^ Using a screwdriver, lift cover of multi-pin connector and remove.





^ Using a small screw driver, push purple latch in direction of arrow.








Pin assignment of harness connector T25 and ABS Control Module (w/EDL) -Jl04-





^ Using extractor tool from harness repair kit VAS 1978, push out applicable terminals.
^ Disconnect wheel speed sensor and speed sensor wiring connector.
^ Replace faulty wheel speed sensor wiring.
^ Connect speed sensor to speed sensor wiring.





^ Secure wheel speed sensor wiring (arrows).

Note: Make sure the wiring is not twisted in the wheel well.

^ Install pin connectors in connector housing.





^ Using installation tool from VAS 1978, push individual wire seals to stop.
^ Secure terminals by engaging purple latch and install connector cover of multi-pin connector.