Well I couldn't get that relay off! Could get all the other relays in the fuse box off - but not the ABS Pump one! I gave it a good tug, but I wasn't going to break it, so left it be.
Plan B time. Actually that was Plan B, so turned to Plan C
I took the FL and RR (ie the ones on the circuit for the FL) brake pipes out of the ABS Unit. Pumped the brakes and nothing come out! No signs of anything - not even any bubbles. I knew the master was pumping fluid as I'd loosened the pipe coming from it.
So fluid must be going into the unit, but being swallowed by some cavity and sucked back out. So I got a small syringe (one we poke down the dog's ears!) and filled it with fluid. Then pushed it into the FL hole in the ABS Unit. Some just spilled out - but less than was pushed in! So repeated until it was obvious nothing more was going in. All this time, no signs of movement from the RR hole - which surprised me. So, I took the syringe to the RR hole. Same as with the FL, but this time it also started spilling out of the FL as well. So pumped the brake peddle. Bubbles and spitting from the holes - good signs, some fluid spilled and fluid receeded back down holes. So syringed them a couple of times and press of brake - repeated a few times till bubbles basically stopped.
So, time to test. I wanted to know the circuit was just feeding the FL, so I took the crimped 'plug' that was in the RR when it was supplied and bunged that back in. Reconnected the FL brake pipe and called my able assistant to pump the brakes. First pump, out came fluid
So I bled the whole brake fluid reservoir from max to min through the wheel, then moved onto the FR. That bled fine, so once again bled a whole reservoir full through it. Onto the RL and same there. Onto the RR and no fluid!
Feck, Bugger, S**t, Bugger. But the brake peddle was hard on this wheel. So I'm thinking as its dual circuit, the bled circuit is stopping the peddle being pushed. So jack the other rear side up as well and bleed that (again!) at the same time. Peddle moved this time, but still no fluid from RR!!!!!!
Inside to get a cigarette. As I walk around the front of the car, I happen to look at the ABS Unit and see that I still had the bung in the RR hole
So sorted that and bled the RR. Tidied up, put the new battery on, calibrated the back window and out for a test drive. The brakes work - they stop the car and no pulling left or right, but they're not fantastic. So I think I'll go buy another 3 bottles of brake fluid and give them another bleed tomorrow.
Still got the Amigos, so looks like the code will need clearing (or after all this I was sold a duff unit!).