Brakes - General
The brakes on standard scoots are decent at best. They work by expanding curved pads against the inside of the wheel drum to slow the wheel itself. While the system works well it can get a little inadequate when you are trying to stop a tuned bike from 80 MPH. The shortfalls of this system can be:
The best solution is to go hydraulic but it requires a load of parts and some engineering knowledge. I'll try to show what I have learned on a couple of projects.
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Vespa Semi Hydraulic Disk Installation
Lambretta ScootRS Disk Installation - Part 1
Lambretta ScootRS Disk Installation - Part 2