Hi, and welcome to the forum.
The Manual also gives definitions of what is considered to be insecure….
10 Definition of insecure
The term ‘insecure’ is used many times throughout this manual to describe a defective condition. This term should be taken to mean one of the following:
a component has relative movement (looseness) at its fixings where there should be none
a component has relative movement (looseness) to an associated component where there should be none
a component critical to safety isn’t safely or completely attached at its fixing or to an associated component
As Paul has pointed out, the braking system is safety critical so it would probably be worth fitting a new bracket before MOT.
