465019 Removing and installing front brake disc
WM 465019 Removing and installing front brake disc
Information
Note on pictures shown
Information
- The pictures shown in this document may differ from the original.
- However, this does not affect the validity and relevance of the pictures.
Preliminary work
Lift the vehicle.
-> 4X00IN Lifting the vehicle Service and Repair.
Remove the wheel. Use assembly aids (assembly pins) -1-.
-> 44051900 Removing and installing wheel.
Brake disc and caliper (shown as an example)
Removing front brake disc
NOTICE
Removing/fitting wheels
- Risk of damage to (ceramic) brake discs
-> Use two assembly pins when removing and fitting the wheel.
-> Carefully guide the wheel towards the wheel hub, thereby preventing any heavy impact on the (ceramic) brake disc.
NOTICE
Removal of brake caliper
- Paint defects on brake caliper
-> Proceed with care when setting back the brake pads.
-> Protect brake caliper from paint defects using a suitable cloth.
1. Screw the two assembly aids (assembly pins) -1- , instead of two wheel bolts, into the wheel hub before removing/fitting the wheel. During removal, first remove the three remaining wheel bolts and remove the wheel carefully without touching the brake discs.
Front-axle brake disc with caliper and assembly aids 1 (threaded bolts for fitting wheel), shown as an example
2. Then (after removing the wheel), remove the two assembly aids (assembly pins) -1- again.
Information
- To gain better access for assembly work, it is a good idea to turn the wheels fully either to the right or left!
3. Partially remove the brake caliper ]]Complete all steps described under "Removing front brake pads" up to Step 8[[. Do not open the brake system! -> 463619 Removing and installing front brake pads 463619 Removing and Installing Front Disc Brake Pads
4. Remove the fastening screw and take off the brake disc.
Brake disc mounting
Installing front brake disc
Information
- Always replace the brake caliper fastening screws following removal!
Do not confuse right and left brake discs during assembly!
Distinguishing feature: Part No.!
1. Check that all parts are in perfect condition (visual inspection) and replace them if necessary.
2. Clean the levelling and centring surfaces on the brake disc and wheel hub.
3. Apply a very thin coat of Optimoly TA to the centring surface on the wheel hub.
4. Fit brake disc. Observe the correct tightening torque.
-> 4X00IN Tightening torques for brake mechanics 4X00IN Tightening torques for brake mechanics
5. Fit the brake caliper -> 463619 Removing and installing front brake pads 463619 Removing and Installing Front Disc Brake Pads.
Observe correct tightening torque -> 4X00IN Tightening torques for brake mechanism 4X00IN Tightening torques for brake mechanics.
6. Fit holder for brake line and wear indicator at wheel carrier.
7. Guide plug coupling for brake pad wear indicator into the holder and connect it.
8. Plug in connector for speed sensor.
9. Position disc brake pads by operating the brake several times.
10. Check and, if necessary, correct the brake fluid level.
-> 470801 Checking brake fluid level Service and Repair
Subsequent work
1. Fit the wheel. Use assembly aids (assembly pins) -1-. -> 44051900 Removing and installing wheel
Brake disc and caliper (shown as an example)
Information on bedding in new brake pads
New brake pads require a slightly longer bedding-in period for PCCB brake discs than cast iron brake discs.
In general, the following applies: New brake pads must be worn in (bedding-in period). Their optimum braking effect is therefore not reached until after a few hundred kilometres. The slightly reduced braking effect must be compensated for by increased pressure on the brake pedal. The same also applies after changing brake discs.