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At this point I'd buy stock 951S front calipers too, but it seems all these old Brembo's became holy grail of eBay. nothing under about 700€.
If you do make sure to purchase the calipers with the dust boots not the scraper rings. It's virtually impossible to get the scraper stuff anymore. I tried and got lucky enough to get a few BREMBO scrapers and finished out the rest of the calipers with Centric ones. Centric ones do not fit properly and I had to use Loctite bearing retainer on them. If you do get the scraper ones and want to restore them DO NOT remove the scrapers or the seals. Unless you have about $1600 can and can somehow find the parts.
If you do make sure to purchase the calipers with the dust boots not the scraper rings. It's virtually impossible to get the scraper stuff anymore. I tried and got lucky enough to get a few BREMBO scrapers and finished out the rest of the calipers with Centric ones. Centric ones do not fit properly and I had to use Loctite bearing retainer on them. If you do get the scraper ones and want to restore them DO NOT remove the scrapers or the seals. Unless you have about $1600 can and can somehow find the parts.
Calipers with scraper rings have a steel insert that's visible on the top of the dust cap. All 1989 944 Turbos should have calipers with "dust cap" seals instead of "scraper rings."
Sold them for 300€ and later found receipt for seals and replacement, all seals were replaced in 2007. Pretty dumbass move. But I didn't know then these can be modified for 320 rotors with slight dremel work and few small spacers.
You can bolt up the non M030 951 front calipers to your M030 951 rears and will compliment your new 993 fronts with all around better braking ability.
So is this the thing? I planned to use stock rear turbo S calipers? What are rear big reds pistons diameter? They dont look bigger than on rear turbo S calipers to me..