I'm no expert but i have owned 2 1969 Rivs, 1 1968 Riv GS, and a 1966 riv gs. The 68 had a 4 piston disc brake set up on it. Had a lot of problems with calipers leaking. Replacement calipers where a little tuff to find but are available but run about couple hundred a piece. Now next problem i had was finding replacement rotors.As far as i know not available. I ended up switching the car over to drums so i could drive it. I don't know if this helps. But i thought i would mention the issues i had with that brake system.
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