Rear, w/PCCB
WM 465319 Removing and installing the rear PCCB brake disc
Preliminary work
Remove wheel.
General warning notes
Warning: Risk of accidents if brake pads and/or brake discs are not replaced in time.
^ Danger of injury and damage to vehicle if braking effect is impaired.
-> The brake pads must be replaced when the brake pad warning indicator lights up, but no later than when there is a residual pad thickness of 2 mm.
Caution: Increased risk of damage to brake discs when mounting/removing wheels.
^ The brake discs can be damaged.
-> Use assembly aid (assembly pins) in order to exclude any possibility of heavy contact of the wheel with the brake disc.
Removing rear brake disc
Warning: Risk of accidents if brake pads and/or brake discs are not replaced in time.
^ Danger of injury and damage to vehicle if braking effect is impaired.
-> The brake pads must be replaced when the brake pad warning indicator lights up, but no later than when there is a residual pad thickness of 2 mm.
Caution: Increased risk of damage to brake discs when mounting/removing wheels.
^ The brake discs can be damaged.
-> Use assembly aid (assembly pins) in order to exclude any possibility of heavy contact of the wheel with the brake disc.
1. The adjustment fixture can be twisted through the bores in the wheel mounting.
2. Turn the brake disc in such a way that the adjustment fixture becomes visible. Using a -screwdriver-, turn the adjustment fixture towards "release" through the bore. Adjusting the parking brake
3. Push brake pads back slightly and evenly using piston resetting fixture (replaces P83) NR.144, see Workshop Equipment Manual, Chapter 2.4 -arrow-.
4. Undo brake calliper on wheel carrier and hang it in a suitable place in the wheel well (do not open the brake hydraulics). To do this, separate the holder for the brake hose/wear indicator at the body side.
5. Remove brake disc after unscrewing the fastening screws. If necessary, remove the brake disc by tapping it gently with a rubber hammer.
Installing rear brake disc
Warning: Risk of accidents if brake pads and/or brake discs are not replaced in time.
^ Danger of injury and damage to vehicle if braking effect is impaired.
-> The brake pads must be replaced when the brake pad warning indicator lights up, but no later than when there is a residual pad thickness of 2 mm.
Caution: Increased risk of damage to brake discs when mounting/removing wheels.
^ The brake discs can be damaged.
-> Use assembly aid (assembly pins) in order to exclude any possibility of heavy contact of the wheel with the brake disc.
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.
Note: When replacing the brake discs due to wear, the brake discs on one axle must always be replaced.
Irrespective of wear, a brake disc change can be necessary on the brake disc friction surfaces due to edge damage. In this case, only one brake disc can be replaced if the friction area surface of the other brake disc is OK.
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. Then apply a very thin coat of Optimoly TA to the centering surface on the wheel hub.
3. Fit the brake disc. Observe specified tightening torque.
4. Adjust the brake shoes of the foot-operated parking brake with a screwdriver.
5. Fit the brake calliper. Replace the brake calliper fastening screws each time they are removed. Observe specified tightening torque.
6. Position disc brake pads by operating the brake several times.
7. Check the brake fluid level and correct if necessary. The brake fluid level must be between the MAX-MIN marking.
Subsequent work
Fit wheel.
Bedding in the 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 kilometers. The slightly reduced braking effect must be compensated for by increased pressure on the brake pedal. The same also applies after a brake disc change.