Exactly, which is why I'd consider it easier to use the early brake system.
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If I plum the rear brakes as lhs and rhs circuits then abs on one wheel each side will work on both wheels on that side however only one wheel is sensing . Limited in capacity compared to both wheels being sensed on separate circuits I agree .
Is it easier to go 85 brake system . Still requires mods to the 94 master cylinder and pedal system .
To be honest the ABS on the 1994 is needlessly complicated compared to everyone else's ABS of the era with that hydraulic pump and accumulator. When that stops working you have very little stopping power. I'd suggest you go out and get a brake booster, front calipers, master and lines off a similar age (94 to 98) non ABS Disco, should be a bolt on fit. Brake lines will need fiddling with anyway, and bundy tube isn't very dear compared to the other stuff you're doing.