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

Cooling Sys, Health Check, etc 29

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Also, the fluid was still sitting at the mating surface of the brake booster cover.





Had to clean it and create smooth surface to get good vacuum seal before installing the new master cyl.





From the paint marking, I already knew that this master cyl was never touched but
I always check the push rod clearance in case someone decided to touch the adjuster behind the booster.





Bench bleeding the new master cyl.



Just need to pressure bleed the brake system while refurbishing the drive shaft,
leave it overnight and then another pressure bleeding next day.
Then, the a/c CCU board service, ABS, etc.


Getting there…..



Kaz












Comments

  1. EK4 hatchback's Avatar
    Dear Kaz,

    I have this exact problem, i wonder if i can fix it by buy the brake master rebuilt kit instead of buy a completely new brake master cylinder. Thanks.

    Best Regards
    Keno
  2. Kaz-kzukNA1's Avatar
    Hi, Keno.

    If you are doing all of the future brake service especially the bleeding by yourself, then using the rebuild kit is one option.
    Not sure when was the last time you replaced the master cyl but if it was long time ago or still the one from the factory, by now, the internal cyl bore has 'step' where the two pistons normally stop when you press on the brake pedal.

    Therefore, if you are not careful, someone could destroy your new piston seals by pressing the brake pedal beyond the normal travel during the bleeding process.
    You must limit the pedal travel by placing something behind the pedal or just use pressure bleeder.

    If you have no idea on the age of your master cyl, just replace it with a new one this time and overhaul it next time although it would be many years in the future.
    Addition to the new piston x 2 and master cyl body, you will get new reservoir, filter, cap&seal, sensor, piston guide, etc so personally, I would just replace it this time.

    46100-SL0-954: BR master cyl, same for all year models, LHD/RHD, variants, except for NA2 NSX-R.

    If you want to rebuild it by yourself, then the kit is 01462-SL0-951.

    Kaz

  3. EK4 hatchback's Avatar
    Hi Kaz,

    Thanks for your reply, i do plan to this myself. I am buying a pressure bleeding tools for this purpose. I think i will opt for new brake master cylinder, i think the one in my NSX is the original one from factory as i am the 2nd owner since 2003.

    I am not sure if you remember i have asked you about my ABS issues when i have a garage replace/update my ABS system to +2000 version which i am using a NSXR ABS modulator. Would that be a good time for me to replace my brake master cylinder with a NSXR spec.? Thanks.

    Also i have a question on how you treat those rust as i read your blog, you mentioned you will apply some special treatment to the cleaned rust area for better vacuum seal. Could share how i shall treat those rust area? I can use sand paper to clean it up but without some paint or treatment it would rust again very fast. Thanks.

    Best Regards
    Keno


    Quote Originally Posted by Kaz-kzukNA1
    Hi, Keno.

    If you are doing all of the future brake service especially the bleeding by yourself, then using the rebuild kit is one option.
    Not sure when was the last time you replaced the master cyl but if it was long time ago or still the one from the factory, by now, the internal cyl bore has 'step' where the two pistons normally stop when you press on the brake pedal.

    Therefore, if you are not careful, someone could destroy your new piston seals by pressing the brake pedal beyond the normal travel during the bleeding process.
    You must limit the pedal travel by placing something behind the pedal or just use pressure bleeder.

    If you have no idea on the age of your master cyl, just replace it with a new one this time and overhaul it next time although it would be many years in the future.
    Addition to the new piston x 2 and master cyl body, you will get new reservoir, filter, cap&seal, sensor, piston guide, etc so personally, I would just replace it this time.

    46100-SL0-954: BR master cyl, same for all year models, LHD/RHD, variants, except for NA2 NSX-R.

    If you want to rebuild it by yourself, then the kit is 01462-SL0-951.

    Kaz

  4. Kaz-kzukNA1's Avatar
    Not much point in using the NSX-R master cyl because that will force you to replace the vacuum booster as well.
    The mounting shape is different and you won’t get NSX-R setup any way.
    It’s a complete package including the chassis setup, tyre, etc so for standard model, just use the standard setup.
    For the procedure and chemical I use, these are for the owners taking my services so I would like to keep that way .

    Kaz
  5. EK4 hatchback's Avatar
    Quote Originally Posted by Kaz-kzukNA1
    Not much point in using the NSX-R master cyl because that will force you to replace the vacuum booster as well.
    The mounting shape is different and you won’t get NSX-R setup any way.
    It’s a complete package including the chassis setup, tyre, etc so for standard model, just use the standard setup.
    For the procedure and chemical I use, these are for the owners taking my services so I would like to keep that way .

    Kaz
    Hi Kaz,

    Thanks for your reply. I now undersatand about the brake master different, thanks.

    I will just sand it and spray paint to prevent it from rust. Thanks!

    Best Regards
    Keno