(The following report describes a defect concerning the Supplemental Type Certificate brake installation: SA13GL.)

A submitter states, “In both brake assemblies (P/N 30-63A) the cylinders (P/N 091-02200) were found to be cracked across and parallel to the anchor bolt hole (bolt P/N 069-00400). This is the second aircraft I have found with cracks in (these cylinder assemblies). This (brake) area is readily accessible and should be part of the preflight inspection. The cracks are easily seen when you are looking for them.”

Part Total Time: (unknown).