I've got an '89 FC GT-R (no, that's not a joke) and I've been in need of a replacement for the master (partially solved) and booster, but I cannot find boosters anywhere. I believe it uses the S5 N/A non-ABS brake booster from USDM FCs, I ordered an S5 TII booster and it is not the correct size/hardware. Does anyone have a lead on getting them? I talked to Mazda Motorsports and they said they do not make them anymore as of 2017 and none of my usual parts places have them. I don't know if times have changed again, but yahoo auctions sellers will often cancel a winning bid if it is not shipping within Japan for these parts.

Also if someone can post a good pic of the S5 N/A booster so I can confirm it's the same that would be very helpful! Thanks for any help folks.


EDIT: ABS Power Brake in Temecula, CA has said they can rebuild vacuum boosters (no place locally does anything besides hydraulic rebuilds). I will probably ship mine to them to get a quote, will update with more info at that point.

 

Don't know whether you're looking used:
www.car-part.com

 

lots of people list the part number, but nobody has anything.

i had the booster (on my 82) rebuilt locally, it was $80. actually if you look at the manual it looks pretty simple in there (although there is a big spring)

for an S5 with no ABS and Hard suspension (not special) the booster is F044-43-800D, which is the same as a JDM S4. the other option is F065-43-800A

actually both of these look available in Japan, https://www.amayama.com/en/part/mazda/f04443800d