| Wear assessment by weighing brake disc |
| On these models (8E and 8H), ceramic brakes are fitted only at the front. |
| Special tools and workshop equipment required |
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| Use commercially available scales with a weighing accuracy of +/- 1 gramme. |
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| To weigh brake disc, remove brake disc first. |
| The brake disc must be cleaned and dry before it is weighed. |
WARNING | Do NOT clean the brake disc with water or other fluids as this will distort the weighing result. |
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| The brake disc vent holes must be completely free of brake dust and dirt. Clear out carefully with a suitable tool if necessary. |
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| Also thoroughly blow out the brake discs with compressed air between the cooling channels and vent holes. |
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| Carefully place the clean, dry brake disc on the scales. |
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| Carefully place the clean brake disc on the scales. |
| The initial weight of the brake disc with disc brake hub is engraved on the disc brake hub. |
| For this model, the following maximum value is specified for brake disc weight loss: |
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| Front brake disc: Up to 200 g weight loss compared with initial weight of new brake disc. |
Note | If the weight loss is only 20 g within the limits, additionally check the wear of the brake disc on the basis of the wear indicators → Chapter. |
| If the values are at or below these limits, the brake discs must be renewed. It is no longer permissible to use these brake discs. The brake disc must be renewed. |
| Always renew brake discs on both sides of axle if: |
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| the brake discs have to be renewed due to wear. |
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| there has been a technical modification to the replacement brake disc (indicated by changed part number). |
| In this case, always renew the brake discs on both sides of the axle. |
| When doing so, always renew the brake pads on both sides of the axle. |
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