Outer Limits 4x4 Board

Just a quick question for a mate
When changing from drums on the front to disks what needs to be done about the power booster. Does the booster need to be changed or just the master cyl. or neither or both. Any help would be appreciated.

mate when i put disc brakes on my 40 sreies all i changed was the master / cyl , the brakes work great no probs for 18 months so far .

Thanks