R32 Gtr Abs Removal

[No.96]

G'Day,

I want to remove the ABS off my GTR. I assume I use a GTS-T master and run some new lines, but what happens to the attesa system, as it uses the ABS sensors. Will unplugging the abs unit interfere with the 4wd?

[djr81]

What makes you say that?

The ATTESSA unit has a number of inputs/outputs that also affect the ABS operation. So if you deactivate the ATTESSA system you render the ABS useless as well as the 4WD system. But this is not the same as saying you can/can't remove the ABS without upsetting the ATTESSA system.

Secondly, why would you want to revert to a GTS-T master cylinder? It is too small in bore size.

[heller44]

My mistake, looked through the manual and it seems that losing any of the abs actuators / motor relay / or circuit will just disable the abs not 4wd, as you said. I was thinking along the lines of the hicas where one thing kills the lot in that module.

A question for you as well,

What is the bore size of gtst and gtr master cylinders? I have 32'R brakes and I am unsure of the master cylinder matching, brakes are horrendous though..

[djr81]

I understand* that the R32 GTR master cylinder is 1" whereas the GTST is 15/16's.

And yes the GTR brakes are ordinary. You have to ensure they are bled properly & you have good pads & rotors. Even then.....

*ie not 100% sure.

[No.96]

Secondly, why would you want to revert to a GTS-T master cylinder? It is too small in bore size.

I thought the GTST and GTR Caliper's had the same size pistons, therefore, I thought I would use a GTST non ABS master cylinder with the three outlets. Is this not the way to go? What is the way to go?

Has anyone disconnected their ABS unit and done a launch to see if all 4 spin? I would but my engine is broken.

[heller44]

from http://nissans15.com/brakes.htm

Model Type Master Cylinder Diameter

S15 Spec R BM50 25.4mm

300zx turbo BM50/57 25.4 and 26.9mm used

R32 GT-T M-spec BM50 25.4mm

R33 GTST BM44 23.8mm

R32 GTR non Brembo BM50 25.4mm

R34 GTT ? ?

R32/33/34 Brembo* BM57 26.9mm

* GTR N1 Skylines apparently used the BM50 MC.

also this might be interesting, someone else chasing a 3-port 1" master cylinder.. http://www.sillbeer.com/2007/04/brake-mast...er-upgrade.html

But looking here http://www.ipixel.com.au/temp/bnr32n1bmc/bmc-46010-range.gif there is whole slew of different models used.

Looking at the bmc from the drivers side the model is towards the booster right next to where it says nissan. Last digits of the part number are stamped on the very end of the unit, for example mine are 05u20, ie 1".

Edited August 27, 2008 by heller44

[No.96]

Thanks for that.

So if I disconnect the ABS wiring the Attesa will still work?

[djr81]

from http://nissans15.com/brakes.htm

Model Type Master Cylinder Diameter

S15 Spec R BM50 25.4mm

300zx turbo BM50/57 25.4 and 26.9mm used

R32 GT-T M-spec BM50 25.4mm

R33 GTST BM44 23.8mm

R32 GTR non Brembo BM50 25.4mm

R34 GTT ? ?

R32/33/34 Brembo* BM57 26.9mm

* GTR N1 Skylines apparently used the BM50 MC.

also this might be interesting, someone else chasing a 3-port 1" master cylinder.. http://www.sillbeer.com/2007/04/brake-mast...er-upgrade.html

But looking here http://www.ipixel.com.au/temp/bnr32n1bmc/bmc-46010-range.gif there is whole slew of different models used.

Looking at the bmc from the drivers side the model is towards the booster right next to where it says nissan. Last digits of the part number are stamped on the very end of the unit, for example mine are 05u20, ie 1".

So the non M spec R32 GTS-T has what size master cylinder?

[heller44]

That would be a good question, maybe someone who owns one can tell us.

[Swiper the Fox]

short answer, yes.

shorter more correct answer...no

[luke james]

Why get rid of ABS ? why not just put a switch in to turn it of thats all thats done to mine and when I want ABS again I just turn it back on problem solved

[stig0000]

Awake this thread . I want to disable abs for now to later remove. Is there something I can unplug for now to disable abs tho keep atessa working.