Vespa break light not working - 2009 Vespa LX 50 2T

The brake lever also activates the brake light, their may be a break or short in that wire ( easiest check) and second guess would be the wire which activates the starter,

heres a list of my vespa workshop manual.hope you can sort vespa ws manuals
vote me if they help.all are on dropbox cheers

That would indicate that you have a short to ground in the circuit, so that when you apply the brakes, you ground the system and the lights cut off. Check all of the wiring carefully, especially at the brake lever and make sure that when you move the lever, no wires are caught or moving.

The oil sensor may be bad, or the oil level may be too low. If the motor reads a low oil signal or no signal it will not start to protect itself.

oil seals leak because the shaft is not held true in the seal
check for bad bearings or bad adjustment of the bearings and shaft

check the connection of the bulb ensure itis fitted correctly also check fuses it maybe that the bulb for the lights has blown, it is common that the brake light is on a seperate fuse for safety.

Could be a deficient battery, malfunctioning solenoid, starter is burnt, starter switch, or brake light switch, as these are necessary. If your brake light is not working, that's it. I need more information.

either a broken gear or cable would be my guess.