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1984 rx7 gs with rotors on the rear. took off the original brake caliper on the rear and found the slide pin to be siezed, to no avail i cannot get it unseized. looks like i cannot get them any more even remans from autozone and oriellys they are on their website but says call store to order and there is no home delivery available which i think means they are not available,,,,,what can i do to replace them...looked on ebay, atkins, mazdatrix and RB none to be had...please help
Even when the rears calipers where available, it was hard to find them with the bracket. You might need to just cut the slider and find another slider and bracket. At lease you'll have a caliper.
I had a somewhat similar issue with my rears too on my 87 GXL. If you have tried all the conventional methods like soaking with your favorite spray and respray repeatedly, adding some heat or cutting off the spindle and replacing, if possible, try again. If you don't have the time or patience to do all of that perhaps a forum member has an extra.
I soaked my calipers and parts in a tub of EvapoRust. It does work well, check everday, clean off residue and pry at the stuck parts, re-submerge parts in the solution and repeat till you get the desired result. If the mixture turns black and stops working, replace the liquid and start over. Clean with brake cleaner, wax and grease, choose your color, mask the part,paint, throw them in the grill to bake the paint on and then rebuild. This isn't a fix all but it could work.
I contacted a local industrial brake shop and each caliper was more than $300 each to be professionally redone. Most likely they would be able to unstick the rusted part too.
Edit: In the time that I took to type this, there were some responses. There is repeat info here.
Here is an option that may work for you, CARDONE has a Rebuild and Return on auto parts for individuals (see link below.) There is a R&R online form you fill out for the part you want rebuilt however, you need to take the form to an auto parts store. They will fill out the "billing" section and will deal with the shipping and receiving of the part for you. CARDONE doesn't deal directly with consumers but considering that you would most likely find a Unicorn before you find a rear caliper for a 1984-85 GSL/GSL-SE it's worth a shot. Good luck!
A quick Google search shows Advance Auto Parts, O'Reillys, and Acme Auto Parts in Michigan carry CARDONE parts so they could help you out. Find the closet one to you and go and talk to them, I venture a guess that most auto parts stores carry CARDONE "rebuilt" auto parts. Back in the day before the internet, and automobile forums, you needed parts you went to the parts store and bought a replacement part and they usually required a core charge. They would give the charge back if you brought the part part in, they and they were sent out to be rebuilt and put back into the supply chain. How many guys on this forum have "rat-holed" or "stockpiled" RX7 parts? The selling of parts between members means old parts were not cycled back into the parts system to be rebuilt and added to the supply chain.
I know that, if you re-read what wrote when I sent you the link to the CARDONE website I didn't say you could order parts from CARDONE, They have a repair and return service where you can send them "your" calipers to be rebuilt and returned. You fill out the online request form and take it along with your calipers to a auto parts store that carries CARDONE parts. They will do the billing, shipping and receiving for CARDONE. As I mentioned CARDONE "does not" deal directly with individuals, only with partners, I am listing CARDONES customer support phone number below for their "Repair & Return" program, give them a call Monday and explain situation and ask what auto parts store in Michigan participate in this program. As an owner of a first gen RX7 you have to get inventive, and think "outside the box" trying to find, repair and get parts there is nothing "easy" about it, but it can be done. Owning one is a "journey" not a "destination."