Brake mount -How to DIY your bike with good carbon frame

Brake mount 

This is how your rear brake mounts to the frame. 

Older mountain bike frames: Cantilever or V-brake calipers. These mount to two posts which will be on the fork legs and seat stays.  
Rim brake/Older road bike frames: Rim brake calipers. These mount to a single hole located in the fork crown and a seat stay bridge.  

Modern mountain bike frames: Post-mount or I.S. mount disc brakes. I.S. mount will require the appropriate adaptor for your brake disc size. For post-mount, you might need a caliper spacer if you wish to fit a larger brake rotor.
Road, gravel, and cyclocross bikes: Older models have post mounts for disc brakes. A few years ago, flat-mount disc brake calipers became the preferred standard.