resumeIn brief
The appearance does not fully indicate the state of the node.
Useful to know
With a drum brake, the jaws work towards the inner surface of the drum. HELLA considers drums, jaws, and cylinders as a collaborative system with specific applications. [1]
Therefore, a picture of the outside is not a complete review. Appropriate access, evaluation and measurements are required under the manufacturer's procedure. Do not define an allowable internal size by approximately a similar part of a catalog. Distinguish a model name from the exact braking configuration: one car series can use more than one performance.
Sources
For further detail and to check the information: