465119 Removing and installing front PCCB brake disc
WM 465119 Removing and installing front PCCB brake disc
Preliminary work
Removing PCCB brake disc
Remove the wheel. Use assembly aids (assembly pins) -1-.=> 44051900 Removing and installing wheel.
PCCB brake disc and caliper
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.
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.
PCCB brake disc with front-axle caliper and assembly aids 1 (threaded bolts for fitting wheel)
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. Press the electric line for the speed sensor/wear indicator out of the holder.
4. Undo the plug coupling for the speed sensor/wear indicator on the wheel carrier.
5. Loosen holder for brake line at the wheel carrier.
6. Disengage the electrical line for the wear indicator from the clips.
7. Set the brake pads back slightly and uniformly using water pump pliers.
8. Undo the brake caliper on the wheel carrier and hang it in a suitable place in the wheel well (do not open the brake hydraulic system.).
9. Remove the fastening screw and take off the brake disc.
Explanation of 2-part brake disc
1. The PCCB brake discs consist of two parts on the front and rear axles. The brake disc -1- is screwed to the brake-disc chamber -2- with 10 screws (M6) -3-.
2. Only the complete brake disc is available as a spare part (disc + brake-disc chamber).
3. Do not separate the brake-disc chamber -2- and brake disc -1-. In addition, the screws -3- must not be turned and should not need to be turned. The screws are prevented from turning by compression in the bushing.
4. It is essential that the tightening torque of the 10 screws is not changed (do not turn the screws) as this will have a negative effect on the sound behaviour.
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 characteristic: Part No.. The flat surface of the brake discs is marked with R = right or L = left.
1. Check that all parts are in perfect condition and replace them if necessary.
2. Clean the levelling and centering surfaces on the brake disc and wheel hub.
3. Apply a very thin coat of Optimoly TA to the centering surface on the wheel hub.
4. Fit the brake disc. Observe tightening torque. => 4600TW Tightening torques for brake mechanics
5. Fit the brake caliper. Observe tightening torque. => 46 Tightening torques for brake mechanics - section on "Technical values"
6. Position disc brake pads by operating the brake several times.
7. Check brake fluid level and correct it if necessary. The brake fluid level must be within the => Marking on brake fluid reservoir MIN/MAX marking.
Marking on brake fluid reservoir
Subsequent work
1. Fit the wheel. Use assembly aids (assembly pins) -1-. => 44051900 Removing and installing wheel
PCCB brake disc and caliper
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.