Front Pulse Wheel Replacement

Front pulse wheel replacement

Special tools:
999 5694 Socket 999 5694 Socket

Note! A new drive shaft is always delivered with a pulse wheel.

Removing front brake caliper
Remove the wheel cover/cap, loosen the drive shaft nut. Support the car and remove the wheel.

Remove
- the brake hose from the support.
- the sensor cable from the supports.
- the two bolts from the guide pins and take the caliper of, hang it on a steel wire to avoid damaging the brake hose.
- the brake pads, see Replacing front brake pads Replacing Front Brake Pads.

Removing drive shaft from knuckle




Turn the steering wheel to the left.
Push the shaft out of the knuckle.
Remove the nut from the drive shaft.
Remove the two shock absorber bolts.
Push the knuckle and drive shaft down.
Push the shaft out of the knuckle.

Removing pulse wheel from drive shaft




Tap carefully with a small chisel between the pulse wheel and the drive shaft until it is freed.
Make sure that the drive shaft is not pulled out of the transmission.

Note! Correct any damage that occurs.

Checking drive shaft install
Check the drive shaft for out-of-round at various places using a micrometer.
Maximum out-of-round 0.05 mm.

Installing pulse wheel to drive shaft





Note! Take care to avoid damaging the bell joint and/or pulse wheel.

- Clean surface.
- Position the pulse wheel on the drive shaft.
- Install 999 5694 Socket 999 5694 Socket and use a drive shaft nut with flange (model year 1998-) to press the pulse wheel to the end of the drive shaft.
- Check installation is correct for fit.

Installing drive shaft in knuckle
Check the sealing ring in the knuckle.
Carefully install the shaft in the knuckle.

Install
- a new retaining nut and ring on the drive shaft.
- the knuckle in the shock absorber support, using new bolts and nuts. Tightening torque 90 Nm.

Finishing
Turn the steering wheel until it is straight ahead
Install
- the brake pads, see Replacing front brake pads Replacing Front Brake Pads.
- the brake caliper, see operation Front brake disc replacement Front Brake Disc Replacement.
- the brake hose and the sensor cable in the supports.
- the wheel, see operation Replacing front brake pads Replacing Front Brake Pads.
- the drive shaft nut.
- Tighten with 240 Nm.
- (From chassis no. 130000, tighten the drive shaft nut with 120 Nm + 60 °.)
- the wheel cover/cap.

Warning! Always depress the brake pedal several times before driving the car!

Check the brake fluid level.

Checking correct operation of ABS system
Read out the DTCs.
Carry out a test-drive and check whether the ABS warning light goes out.
Read out and check whether there are any DTCs stored.