I would just leave it the way it came from the factory it would be costly to change it. If it was even a option to have rear discs drums work just fine.
June, 16, 2012 AT 1:02 PM
Changing from shoes to disc does not make braking efficiency improve under normal circumstances.
The brakes are well calibrated and you should not be changing the rear to disc hoping that it would improve efficiency. The reason for disc is that it dissipates heat faster so the only time it would be different in efficiency is it does not fade as fast as a drum brake system and this occurs only when the brakes are used excessively.
If you are planning to use the car for racing purposes, then it would be the thing to do.
June, 16, 2012 AT 1:34 PM
Also make sure you keep the rear shoes properly adjusted.