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Today at Atelier Kaz - Private NSX Enthusiast, ex-Honda R&D engineer with F1, Indy/CART background

Brake OH, etc 07

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The FR brake pipe fitting was overtightened and heavily corroded. Looking at the angle of the pipe,
there is a chance that it was somewhat forced/cross threaded during the installation of the aftermarket brake line.

I just hope I can get it loosened without damaging the fitting. Time for the acetone/ATF mixture.

If the worst comes, I have the new FR brake pipe line in stock any way but that was purchased for the ABS Upgrade for the next NSX waiting for my service so would love to avoid using it.
I don’t like using the flair nut repairing tool to add extra line/fitting as it’s just another source of potential future issue.




All four callipers had some sort of issues so none of them were working in perfect manner……
Not sure what kind of grease was used but it was dried up and turned into white solid objects.......
The lower slider pin at FR and FL callipers as well as the upper one at the RL corner were all seized and preventing the smooth movement of the calliper.

The owner told me that he had the RR corner serviced recently and yes indeed, the slider pins were moving freely but they were installed in the wrong orientation/position.
The upper and lower pins have different shape/spec.




Looks like all of the callipers were never overhauled. This NSX is the low mileage and almost the final production year model so if your NSX is older than this one (and almost likely to be the case for you) and haven’t overhauled the callipers yet, then chances are, you could be in the same boat.

The smaller piston at both FR and FL callipers were still moving but not quite.
From the rust markings, I think it was originally seized when the previous brake pad was still in use.
Then, the pad and disc were replaced but once again, it caused the corrosion and prevented the smooth movement. No way I can re-use them so just going to replace them.
You can prevent this from happening if you check the operation of piston and slider pin regularly.

I recommend overhauling the callipers at least at the time when you need to replace the pad/disc for mainly street usage.
In Japan, by law, we used to be forced to overhaul it every 2 years but that was too excessive so the law has now changed and bit more relaxed.




The rear pistons were in better condition but they were showing the sign of corrosion/markings at two different areas so again, one of them at the time of previous pad and the other one after replacing the pad/disc.




Will need to carefully inspect how far the rust managed penetrating into the calliper bore but I must clean them first as they are covered in all sorts of brake dust, debris, etc …..
Not good for the health….


Kaz


Comments

  1. nikey22's Avatar
    Is the 36mm piston discontinued? Or are they readily still available
    It seems the square-cut-seal and the dust boot can be purchased as part of a kit, but how about the pistons. Thanks
  2. Kaz-kzukNA1's Avatar
    Hi, nikey22.
    This calliper is the later spec one so it uses the 34mm piston and not the 36mm one.
    However, I ordered the 36mm piston last month from Japan with no problem so should be still available.

    From time to time, the pistons are on back order so depending on the timing of order, you may hear that it’s not available with no info on the next delivery schedule.
    I started keeping at least one full set of piston and service kit for both the early and later spec callipers.

    If the worst comes, we have our own member Jonathan (aka britlude) who created the stainless piston for his NSX so not worried too much.

    Kaz
  3. NSXGB's Avatar
    The U.S. parts sites list the 36 mm piston as unavailable but UK (Lings) show as available. Very strange.