[TeZla]

In the discussion started on the other thread TeZla had some great points. The only thing I would say was I was only looking for a parking brake. I wouldn’t want to rely on the unit as my only source of braking. I actually am thinking of an iBooster down the road as a separate project.

Nothing, not even tesla use a fully electric brake, Its always hydraulic. The electric component is only the handbrake. (and ibooster)
If your only using the caliper as a park brake, there are probably more compact options out there if you didn't want the use the whole bulky tesla caliper.
with it mounted as a pinion brake, were you planning on using the hydraulic part as well? or just keep the factory landrover drums? Willwood do a E brake caliper thats specifically for the park brake.

Wilwood Disc Brakes - Electronic Parking Brake Calipers

Wilwood Engineering manufacturers a wide variety of different lightweight, high performance, and extremely durable aluminum calipers in small, medium and large sizes. Electronic Parking Brake Calipers

www.wilwood.com

They also do a caliper control box, but not sure how it'd interface with anything non wilwood? The calipers look like they use the TRW motors, with the standard 2 pin plug

Wilwood Disc Brakes

Controller EPB-Dual Caliper, brake hardware, hardware, cap, cable kit, parking brake, push rod, parking brake kit, pedal, clutch, pin, clevis, eyelet, lever, bushing, knob, actuator,620-15487

www.wilwood.com

Also, as a thought to consider, Im helping my friend making a V8 SWB land rover. We had the same handbrake issue once we put the V8 in, the drum fouls on the mid chassis crossmember. He ended up using an off the shelf land rover disc brake handbrake conversion, Bought fromthe UK somewhere I think? That could be an option for you, as in the caliper bracket and mounting position?
Disc Handbrake Conversions - Paddock Spares - Paddock Spares (This one I think?)

Also, have you seen this thread?

https://www.aulro.com/afvb/the-modified-zone/187685-electric-park-brake-conversion-defender-2.html?s=10cc0c10cf84763419eeab6c50c68d53

They don't really talk much about the electric caliper, But there are pics of the X-Engineering brake caliper conversion

 

[TeZla]

do you have any warning light output from the calipers? What happens if the driver doesn't fully release it and goes for a long drive?

Ohh, i've seen the results of this haha.

Back when I was silly enough to turn spanners for everyone else, We had a bunch of Mercedes Sprinter vans come into the workshop for a recall, They were retrofitted into ambulances for the Victorian Ambulance Service. The outfit that did the retrofit managed to disconnect the handbrake warning light on the dash of every single one they did, so we got the recall job to fix the wiring problem and replace the rear brake rotors and handbrake shoes. The paramedics would often forget to disengage the handbrake all the way because it was located so low on the floor, It actually took leaning sideways on the seat to really put it down. The engine was plenty strong enough to overpower the handbrake and they'd drive away, the shoes inside the drum would burn out and cook the rotors. The worst one we had got so damn hot it actually split the disc from the rotor hat, Boom, no more rear brakes and a fully floating rotor.

A tourquey electric motor should have no problems at all overpowering the handbrake...