I canot pull the lever to disengage to a free wheel

Your brake my be locked up due to corrosion . Take scooter and tilt it up so you can see under it and take spraw lube and spray where the lever goes into the brake assy then work up down or back and forth and it should lossen up

I got tired of my electric brake on my gogo messing up all the time..so I took it off my scooter your scooter will still stop just find. But it will be able to free roll when you stop so if you are on a incline it will roll. to fix this problem I put a brake on the front of my scooter ...I took it off of an old ten speed bike I also bought a walker lever that lock when you push the handle forward no more free rolling.
The scooter has been working great with out that old electric brake.
Also with out the electric brake the battery's last I think twice as long...that electric brake pulled a lot of juice.
It has been about 6 years and still going strong :)