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The brake switch on the right side is well on its way out. It will eventually stop working completely.
As for the left side, it is an electrical issue of some sort, but you will need to do some electrical diagnostics to find out what exactly is at fault. It could be a break in the wire, or at the switch connector, or it could be that the switch itself is dead. I can tell you that the problem with the right brake switch is not causing the left brake switch to be unresponsive, both switches are usually wired in parallel on a Chinese scooter.
As for the starter lockout, that is by design. You aren't supposed to be able to crank the motor over unless you have the brakes applied. Otherwise, you run the risk of falling and/or dropping the bike. This ensures that you already have at least one hand on the handlebar, covering the brake.
Most bikes use the brake lamp system to detect this. When you hold in the brake, it energizes the tail light, which also energizes the engine start button. If the brake switches are toast (or not activated), the start button (and starter relay, and starter motor) will not activate.
The fix is to repair whatever's wrong with the brake lamp system, not override the starter. It's a safety issue.
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