Here is a summary of the last four months' occasional work on the car.
Front brakes are ready according to Gr.2 spec (vented discs and 54mm calipers). Making them fit to the standard Alpine stub axle carriers and hubs needed measuring, spacing, milling, and some thin spacers to be fabricated. I decided to go to 12mm wheel studs, both because 10mm ones seem fragile for such use, and to have more choices with spacers, and longer studs.
After searching a lot here, I found the correct 20,6mm master cylinder at an old brake parts shop.
I fitted a cheap adjustable rear brake limiting valve, but gave it that "works" look, with a well known part - the same as Renault Sport used back in the 70s!
In the meanwhile I had some braided hoses fabricated.
The rear brakes were a bit of a hassle for me. I had to find a complete Alpine turbo kit, as the car had drums on. This proved to be hard, but in the end I spotted the discs, hubs and caliper mounting plates in a city 500km far from me, and picked them on my summer holidays on my motorcycle. But I was still missing the calipers. A friend of mine gave me a pair of Fiat 124 ones that proved to be unsuitable, since the handbrake lever comes at the wrong place (the calipers on the 124 are fitted in front of the axle). Plus, they have 32mm pistons while Renault ones are 36mm, and I wanted to keep the factory sizing wherever possible. I had a Lancia Beta rear caliper in hand, also using the same Bendix layout, and by experimenting with this I found that, if I reversed the caliper body in the steel caliper carrier, I could bring the handbrake lever (and bleed valve...important) to the correct position on the car, and as a bonus, it had 36mm piston. I decided to use the 124 brake pad carriers, as spacing between the caliper dovetails on the DBA/Bendix system seems to be universal, so I bought a set of EBC pads:
Now I had to search for a second rear Beta caliper which I thought it would be easy, because there were thousands of Betas here, with a lot of specialists. But I was wrong in the end, and I gave up after some two weeks of calls and searching the whole Athens area, without any good result. Considering that the Renault models which were equipped with these Bendix rear brakes (R5 AT, R25, R12 Gordini, R17 TS) were exotic for our market, to say the least, and convinced that no one would had kept spares, I didn't look for the obvious in the first time. But after searching more carefully after the Beta disappointment, I found that there were some newer Renaults that still used these calipers: some few R21s and almost all of the Mk1 and Mk2 Espaces. A few calls to scrapyards later, and I found an Espace at a town far away from me, but the scrapyard owner was more than happy to take the calipers off and send them to me.
And after a bit of work...
. 
