Alter Laravel 5.2电子邮件重置链接功能

I am trying to override the Illuminate\Auth\Passwords\PasswordBroker::emailResetLink() method in Laravel 5.2 to change the behavior. I have to send the reset link and the user email to third party service which will deliver the reset password email.

I have tried to change the binding for auth.password.broker like this:

// $this->app->bind('auth.password.broker', 'App\Auth\MyPasswordBroker');

$this->app->bind('auth.password.broker', function(){
     dd('BROKER');
});

Well it was unsuccessful. It's not triggered and I cannot find a way to alter the method.