| 1. Carefully to clear the brake drum. |
| 2. To measure by a caliper diameter of a working surface of a drum. The most admissible diameter of a drum is 231 mm. If diameter of more admissible, a drum has to be replaced. In the presence risok the drum can be chiseled, but taking into account that its final diameter of a working surface was no more admissible. |
| 3. The most admissible radial beating of a drum measured on a working surface, 0,1 mm, and minimum admissible axial beating of 0,2 mm. |
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