AE92 Caliper differences

[youri]

Hi!
I just found out that 89 and 91 models got different calipers, thos from 91 are a bit beefier, I was wandering if the Master cylinder is bigger too? and is there really any noticeable difference in effiency of the two systems?

[89yotarollagts]

i just thought the rotars are bigger im not sure about calipers

[TRDragoon]

calipers are the same.... the rotor size and the bracket size are Different.

basically, the 88~89 are smaller rotors and 90~91 are bigger.

The rear rotors are still the same.

[youri]

sure of that?
becayse we placed both calipers one against other and the 91 one had bigger piston.
Anyway, If I find 91 brackets, can I keep my 89 calipers and just buy bigger rotors?

what is the difference in the dimensions of both rotors?

[TRDragoon]

not too sure of the diameter.....

i just did a Rebuilt calipper swap with my 1990 GTS....and used a 89 front calipers...same size, just the brackets..

[RedAE102]

I forget if any US AE92s had solid front disks, so I'll include those:
solid (all years): 243 mm x 13.5 mm (diameter x thickness)
early vented: 238 mm x 18 mm
late vented: 258 mm x 22 mm (and E10/E11 I believe, but they might be 255 mm)

All AE92 rear disk brakes are 242 mm x 9 mm

It's the same story with rear disk brakes. E10 and E11 rear disks are larger (266 mm diameter) than E9 rear disks, but all share the same callipers, just longer backing plates. I had to replace my rear callipers as they were sticking, and since E10s were never sold here with rear disks, I bought a pair of AE92 rear callipers and just used the backing plates off the brakes already on my car and they fit just fine.

[youri]

what would be the advantage of swaping bigger rotors in front, keeping 89 calipers? will there by any gain at all?

thanks

[Flashmn]

More cooling area, more gripping area. Sooo.. yes it would be of an advantage.

[youri]

more cooling - ok, I agree, but not more greeeping, the pad stays the same, it doesn't get bigger.

So I need rotors and brackets, and it should work

anybody knows if the master cylinder was bigger on 91 models?

[RedAE102]

Originally posted by youri
more cooling - ok, I agree, but not more greeeping, the pad stays the same, it doesn't get bigger.

So I need rotors and brackets, and it should work

anybody knows if the master cylinder was bigger on 91 models?

The advantages are twofold: better cooling, and more leverage from the pad/calliper being located further out on the rotor.... a LOT more than you would think.

Possibly, but it should still work fine.

[youri]

ohhh!! Nice point RedAE102
thanks!
but since the newer rotors are thicker too, will it still pass in between the old caliper?

[RedAE102]

The difference in thickness is negligible, and if it's not fitting you just have to use a calliper spreader to push the piston back into the calliper. Same principle as when you have to replace brake pads...