The stock calipers on 70 to 78z's can be upgraded by bolting on Sumitumo S12-8 calipers from early 1980's Toyota 4X4 trucks.
Business End (Stock vs. Toyota)
2 pistons vs. 4 pistons
Toyota has bigger braking surface (more friction)
Back Side
Inner side with brake line connection
Outer side
Detail of rods and hanging brake pad.
Nibbling tool
Nibbled dust shield (just needs to be filed smooth and painted).
