Brake shoes are an important part of a trailers running gear they need to be regularly checked and maintained to ensure they work correctly.
Brake shoes comprise of 2 parts. The main body which is of steel construction and is referred to as the actual shoe and the lining which is normally bonded to it.
The lining on the shoes will wear down over time so this needs to be checked regularly. Common things to look out for are:
1: Uneven wear - this can be caused by seized cables, expander or adjuster.
2: Lining worn very low / down to the metal - this can be caused by a lack of servicing, sticking cables or an out of adjustment braking system.
3: Contamination - this can be caused by grease from overheated bearings. In all these cases brake shoes would need to be replaced.