Answers for "error class 'app\http\controllers\brands' not found"

Class 'App\Http\Controllers\Validator' not found

use Illuminate\Support\Facades\Validator;

Class 'App\Http\Controllers\Response' not found

use Illuminate\Support\Facades\Response;
Or
use Response;

Or use full namespace:
return \Response::json(...);

Or just use helper:
return response()->json(...);

Class 'App\Http\Controllers\View' not found

use Illuminate\Support\Facades\View;

return \View::make('tickets.bus.index');