U13 Bluebird Alternative Brake Upgrade For 1200?

[luke]

After spending a few hours at pickapart this afternoon measuring brake disk sizes/bolt hole locations/ ga16de bits(unrelated).
I apologize in advance for my poor descriptive talents.

I have guesstimated since eventually the s13 silvia brakes will run out of cheap convenience, and u13 bluebirds are a plenty and cheap enough. why not.

if someone can make me the adapter plate i need il run them and anyone else can too if bart can sort out adapters, or i can, whichever.

I dont know if any master cylinder changing is required but i guess it would be the same as the s13 conversion.

Sooooo........

*Non turbo front s13 disk is 252mmx20mm ish thick
*Front u13 disk is about 250mm +or-1mm x20mm ish thick.
*Same pcd 4x114.3.
*same slipover style/u13 is ever so slightly lighter.
*Same 100mm between centre of calliper bolt holes.
*The hub will still require machining for these.
*You will still need longer wheel studs
*Since i dont understand single pots/2pots/4pots etc etc i cant say what this type of calliper is sorry, it is bigger than the s13 one in LENGTH ONLY. i.e. length between .....pistons? .... is more spaced out.
*All other nessesary spacings work out. example is gap between disk and adapter plate with u13 calliper is perfectly the same etc.

REAR u13 disk is a direct slip over of standard non machined 1200 hub.......im 99.99% sure.
*This disk is not vented and only about 12mm thick (forgot to measure overall edge to edge but VERY similar to the fronts, just basically half the thickness)
*the calliper has a bolt hole spacing from centre to centre of about 125mm ish (roughly measured so give or take 5mm sorry)
*Since i dont understand single pots/2pots/4pots etc etc i cant say what this type of calliper is sorry.
*This is still an upgrade on the stock disk and i assume calliper of the 1970s era as the standard 1200 disk measures in at 212mmx9mm and u13 is a fair bit bigger.
*An adapter would need to be made for this too.
*Not sure on wheel studs

Hope this helps someone out at some point, and if someone knows someone etc who can make me an adapter then id be really stoked.

thanks.

[Bartman]

I think I tried this, and the caliper piston is bigger than the s13 one.
Therefore it fouls on the caliper mounting eyes on the strut.
I have some bluebird brakes here somewhere. And they didn't work. (From memory)

[luke]

I think I tried this, and the caliper piston is bigger than the s13 one.
Therefore it fouls on the caliper mounting eyes on the strut.
I have some bluebird brakes here somewhere. And they didn't work. (From memory)

bingo! thats why a different adapter needs to be made

[85_Z31]

> slight off topic > luke when looking at U13's did you see any 96's with good panels ?

[Bartman]

If you space the caliper further out, it'll fall off the edge of the rotor......

[gingofthesouth]

Also, did you get all the GA16DE parts you wanted??

[luke]

But not with a new style br acket. I have the measurements that will make it work Bart. Unemployment dies things to a man. Horrible things

[luke]

As for the GA parts, rang Brendan and he said hold off till I know what year GA it is as the manifold changes over the years....

[braasmonkey]

I think I tried this, and the caliper piston is bigger than the s13 one.
Therefore it fouls on the caliper mounting eyes on the strut.
I have some bluebird brakes here somewhere. And they didn't work. (From memory)

Bart, correct me if I'm wrong but didn't Damon (dattodevil) perform this kind of brake upgrade on his GB120 with your input/assistance?

- Braasy

[darrenwilson]

Did anyone complete this setup?
I'll really like to see what you guys are talking about