Front Suspension

WM 405055 Replacing front wheel bearing housing





Replacing front wheel bearing housing - preliminary work
1. Undo the central nut at the wheel carrier at the side of the wheel before raising the vehicle. Actuate the brake while doing this.
2. Raise the vehicle and remove front wheel.

Removing front wheel bearing housing
1. Loosen stabilizer mount at stabilizer (counter with Torx T30).
2. Unscrew linkage for range adjustment -1- (headlight height adjustment) on the trailing arm. Only on left side.





3. Loosen tie rod and control arm at wheel carriers and press off the ball joints with special tool press-out tool 9560. When loosening the lock nuts, counter at the ball-joint pins with special tool screwdriver 9546 (Torx screwdriver).





4. Disconnect plug connection at wheel carrier and pull out plugs. Undo plug connection at wheel carrier and unclip electric wires at the spring strut.
5. Loosen holder for brake line/brake hose at wheel carrier. Loosen brake caliper from wheel carrier and attach in wheel arch.
6. Open luggage compartment and remove the relevant design cover over the spring strut.
7. Loosen cover over piston rod (at spring strut). For PASM spring struts, carefully disconnect the connecting cable at the connector and unclip it from the bracket -arrows-.





8. Mark the installation position of the spring-strut mount (position of the three collar nuts). Loosen lock nuts (3 ea. M8) at spring-strut mount.
9. Pull out spring strut with wheel carrier.
10. Loosen clamped connection between spring strut/wheel carrier (ball joint of stabilizer mount). Counter with open-ended wrench. Pull spring strut out of wheel carrier.

Completing (disassembling and assembling) wheel bearing housing
1. Disassemble old wheel bearing housing and fit reusable parts to the new wheel bearing housing (speed sensor, brake cover plate, lid for wheel bearing -3-, fastening screws -2-, wheel hub -1- and tension bolt).

The wheel bearing -4- must be replaced.





1.1. Take off brake cover plate on the wheel bearing housing. Press wheel hub -1- out of the wheel bearing housing (wheel bearing).
1.2. Remove lid -3- for wheel bearing on the wheel bearing housing (4 screws).
1.3. Press new wheel bearing -4- into the new (heated) wheel bearing housing and complete the wheel bearing housing.

Installing front wheel bearing housing

Note:
^ If assembly work was performed or parts replaced that affect the vehicle height, a complete wheel alignment is necessary.

1. Install in reverse order. Before installing, do a visual check on the parts. Replace brake caliper fastening screws.

The sensor for the range adjustment does not need to be calibrated.

2. Do not grease screwed connections in Dacromet finish - aluminum color. Observe correct tightening torques.
3. Place the spring-strut/wheel-carrier assembly into the vehicle.

Note: installation position of the spring-strut mount. The arrow markings must point to the outer side of the vehicle. The shock-absorber piston rod is thereby shifted outwards. Use new lock nuts. Before tightening the lock nuts, align spring-strut mount in accordance with the applied marking (position of the three collar nuts).

Replacing front wheel bearing housing - subsequent work
1. Fit front wheel.
2. Tighten the central nut at the wheel carrier at the side of the wheel to 460 Nm (340 ftlb.) Actuate the brake while doing this.
3. Check wheel alignment values on front axle and adjust if necessary.