I’ve built many many bikes in my day. I have a full bike mechanic setup at home. I ride road, gravel, adventure, and regularly use both my dirt jumper and my full suspension mountain bike (which is a Norco).

For the life of me, I have no idea what a “rear brake insert” is. There’s a calliper, a disc, some pads, some hydraulic hose. WTF is a rear-brake insert?

Halp. ;)