The aim of this article is to demonstrate the importance of a proper wheel hub.
After removing the old brake disc, the wheel hub must be cleaned with the appropriate tools before building a new brake disc (e.g. wire brush, fine sandpaper, hub cleaning tool, etc.), otherwise it may cause subsequent problems when driving.
For example, problems that occur when braking with a new brake disc as a result of a wheel hub not having been cleaned:
Pulsating brake pedal, steering wheel vibration, judder.
Max. hub imbalance 30 µm (1 µm = 0.001 mm)
The new brake disc can be attached to the wheel hub with fixing screws after cleaning if required. Then, depending on the design and system, mount the brake disc using retaining screws, ideally with the wheel bolts if possible (see ex. picture) and you must check your axial run out.
Set the dial gauge to approx. 15 mm below the largest possible radius. If the bore is larger than 70 µm, turn the brake disc one hole further and measure again. If the bore still measures more than 70 µm in every hole position, check the wheel hub to see if it measures over 30 µm (can also be carried out in advance); measure at the largest possible radius. If the wheel hub is working, there could be a fault in the brake disc.
Max. run out 70 µm