Is this what you were looking for?
http://www.datsun1000.com/TopicView.asp?TopicID=58

theres a dba46 or something avail for 85bucks delivered from China
someone in datsun1200 has ordered one and usually cost over 300
for the reco or locally sourced ones.

Thats strange cause my pedal is really good. All I've done is cleaned the pistons on the calipers, new pads and changed my m/cyl and I have good brakes. Your more than welcome to drive my ute to see if theres any difference. There seams like theres more of a problem if you need alot of pressure to brake.

I've had 1000's for about 28 years
Disc brakes on them for about 20 yrs
And never have I used or needed a booster
 
I'll give you a tip
The piston diameter in your R31 rear calipers are only 1.5" in diameter
They don't apply alot of force to the disc
If you ran say... 2" pistons you would find the effort required to be much less
 
So if say you could find a pair of Girlock front calipers that will go onto the same brackets
They also have 2 1/8" pistons and will change the characteristics and pedal feel immensely
This would facilitate the need for a larger master cylinder though.. .and making a pushrod to suit
I have used the 11/16,  3/4 and 13/16 masters on my cars
The pedal height changes and firms up the larger cylinder you go
My wagon currently runs a 13/16 and I like the firmness and can certainly stop
3/4 might be a good compromise for most people
 
Commodore rear is also 1.5" so no point changing to those... as its the same size as the R31
Unless your calipers have an issue thats causing it
But I believe that setup is too small personally

there is a couple of the Neil complete kits over here in the west,I know 1 possibly 2 are for sale..
 
Billet Hubs, rotors, Callipers (Kits), Master cyl, wheel cyls, braided hoses, pretty full on kit, tried tested and a quality product..

The VS rear caliper is the same piston size
It will offer no improvement in braking efficiency to the R31
Too small I say

So no improvement at all even size or handbrake removal?

I have now re-kitted the calipers. The pedal feel is better, because the calipers are returning properly, but still locking the rears first, even after reducing the size of the slaves. I have ordered an adjustable brake bias valve to solve this problem. The braking on the front seems to be slowly getting better, maby something to do with the disks, since I have definatley overheated them and the pads repetedly to get to this point. There is no longer any rolling resistance which is fantastic.
 
The preasure on the pedal is pretty much the same as standard I think, and there has been some improvment in the brake performance, which I find weird since the rears did not lock first before the conversion. The braking is more gradual as you said neil.
 
Removing the handbrake mech from the calipers fixed the problem I had, in that the calipers would not let go, but no other change to braking. For all intents and pourposes they are no longer hand brak calipers, that part of the insides is no longer there.
 
So, OK then Neil, bigger calipers? Don't supose you know what calipers would bolt on to thoes brackets then?
 
What setup do you run?