Are all 86-91 rear brake calipers the same? Even the ones that use the wider vented hubs? They look very much alike to me. I am just assuming that the vented must open wider? Please let me know if there is a size or manufacture difference. I plan to do the 4 to 5 lug / 4 piston(front) caliper swap. Right now I have solid rear disks. The rears that I am swaping are vented (several mm wider). I would like to reuse the current rear calipers if they are the same. Sum up of question: Is there ANY difference in REAR calipers from 86-91 ALL MODELS (gxl,Turbo,se,etc...)?????

Yes I have searched so please dont suggest that, unless you found it on your search.

 

No they are not.

The caliper for the vented rear rotor has a different P/N than the one for a "normal suspension/non vented rotor".

see:

http://www.mazdatrix.com/j-2brake.htm

Note how the hardware kit is different as well, even though the brake pad itself is the same.

 

I believe they were different sizes, thus the different calipers, however I think they are all 1-piston floating.

 

There are 2 sizes for 5 lug rear ends.
Best bet is to call a local dealer and see how many differnet parts #s there are..

I assume there are 3 sizes. maybe a 4th if verts had a special brake setup

 

So all one piston, but different part numbers (no one knows if they are interchangeable..like...almost eveything else on S5). I wonder if the actual fit is different? I guess I will be the firs one to try it........

 

I don't believe they would be interchangeable, considering there is almost a 1" difference in diameter between them.

 

no, they are not all the same.
the vented ones are wider, they look the same though.

 

ok, thanks, so rear calipers for non vented 10mm hubs are narower then the rear calipers on vented 20mm hubs. Damn, Those things look IDENTICAL!

I am going to have to go examine these things real close, because we are only talking about a 10mm difference (I know .39 of an inch could be alot).

Thanks again for the replys

 

bingo.

good luck with it