I want to add ABS to my Capri. Im looking at different systems and got a few questions. Hope someone can help.

I like that the Sierra doesn't use a servo - the ABS pump does the assistance?

Can I get NOS of bits these days? What other parts of that system would I need apart from the sensors and rings?

Would the ABS pump from a 3i or Rs2000 4x4 work without a servo? you'd need other bits (maybe from sierra?) but is it possible? those pumps, sensors and bits are cheap and plentiful APART from the servo with is several hundred quid.

Also, do these things work on they're own or do you need the sierra or escort engine ecu? I got emerald k6 on my capri
Ive got Sierra rear callipers on it and Brembo 4 pots on the front with 300m disc.

Any help cheers