Brake assembly
Section view
In order for the brakes to function with the most efficiency and least wear, it is imperative that the callipers and brake disks should line up exactly. If they are off by even a few mm, it will force the brake disk to be bent at an angle by the callipers. To prevent this from happening, it is a good idea to allow the brake disks to float on the bobbins so that when the callipers press the break pads onto the brake disks, the break disk can move over the distance necessary to be aligned.
To calculate the float distance necessary, the variance of all the parts that will effect the alignment must either be calculated or estimated.
The variance
-on the upright: 0.05mm
-on the spindle: 01mm
-on the hub face: 0.05mm
-on the callipers:
-on the brake pads: