Hi Mate ! Lots of details on here, if you go searching; regarding brake upgrades on the front of KE30/55/70 Rollas, as Rollas were never well known, for their "great braking ability" I remember reading lots a threads, when I did my front end upgrade years ago, which was a resounding success. However, it involved replacing the whole strut, LCAs, & discs & calipers. When I finished, I found I had to replace the brake master cylinder with a Mitsi Pajero one.
I finished up with Corona struts, 3T Toyo adjustable top pivots, Cresida discs & calipers off to different model Cresidas; & the Pajero master cylinder. It was quite a journey, & I learnt a lot, but the end result, has proven to be reliable & trouble free.
Go back & look through my posts, & you'll find a lot of info there, along with a few pics.
https://www.rollaclub.com/board/topic/63524-ke-3055-brake-upgrade/#comments
Cheers Banjo