Servos that are factury modified for continiuos rotation usually have a pot/trimmer to set the dead point, so that the value of 90 +/-2, is STOP, values above 90 are CW and below 90 are CCW. If you modify your own you need a trim-pot to replace the resistors you removed??
I have a couple of such Servos and find they work very well. Do you want the servo to turn continiously? or just 360 Deg and stop, in which case you will need some form of sensor to detect it (arm, etc).
You opened the servo and removed the brake?? What brake? is that all you did? That does'nt make it continous rotation!!
If you have converted the servo to continuous rotation you have no control over the position it is at - you can only control the speed and direction of rotation. If you need it to stop at a particular place you will need a separate position detector - for example the servo might trigger a microswitch.
And what robin2 says.........
Hope it helps, Regards.