The brake disk is subject to replacement if its thickness becomes less than 9 mm.
We remove a support of a forward brake (see Replacement of a support of a brake of a forward wheel), without disconnecting from it a brake hose. We tie up a support in the convenient place that it did not hang on a hose.

Key "on 12" we turn off two guides of a wheel.

We remove a brake disk and a remote ring.

The new brake disk is established as it should be, the return to removal.