Information On Wear Assessment
WARNING: This page is about a different variant/trim than selected.
- Normally, brake disc replacement is necessary if the thickness is less than the minimum thickness.
- In rare, isolated cases (of very high loads for long periods), replacement may be necessary due to crack formation.
- Up to a certain point, these cracks may be rated as not important. The following sections describe when to replace the brake discs.
- Cracks occur as a result of material fatigue due to frequent and extreme thermal expansion fluctuations. Particularly in cases of very high loads for long periods, these thermal expansion fluctuations produce internal stresses.
- The result may be cracks in the friction surface.
- These cracks allow relaxation of the friction disc so that the speed at which the cracks develop is very slow.
- Cracks run from the centre of the friction surface to the (inner and outer) edges of the brake disc.
- As different vehicle types have different brake disc sizes, differences arise in terms of the maximum crack length limits.
- Larger cracks impair braking comfort and reduce brake disc strength, therefore making brake disc replacement necessary as a precaution.