Geoffman72

Rebuilt them for a friend who is doing a 5 lug swap on his 86 sport. Also did a little polishing with a wire brush on a drill press!







Here we see one side of the caliper with the pistons still in and the other with the pistons out and the seal recess cleaned out with a wire brush. I should also note the guy this 5 lug swap was purchased from thought the RX-7 made a great winter car.









Before and after polishing pics









Different angle









Cleaned up the pistons a bit











And sadly my friend who was taking pics failed to get any after it was all done. They looked brand new!

Seppuku

looks nice all clean like that.

MazdaEnthused

damn i just got four calipers from a junk yard car and they were in better condition then the stock ones look so i think i'm gonna do that exact same thing... is there any chemicals you used? because i will do that myself

Geoffman72

if there are deposits built up on them you can give them a sulfuric acid bath for no more than 5 minutes.

MazdaEnthused

take the pistons out of them and just soak'em in sulfuric acid? and where am i supose to get sulfuric acid and then take a wire brush to them?

j9fd3s

did the o rings for the caliper haves come in the kit?



mike

Leetheslacker

shiny piston thingys!



Nice job.

Geoffman72

J9 - no, the ******* bastards never send those!



Mazdaenthused - Yeah, just do not take the wire brush farther down that the seal recess on the caliper,

and dont brush the smooth uncorroded area of the pistons as any small crevaces can possibly let brake fluid seep through.



As for finding sulfuric acid, its basically the main ingredient in industrial strength liquid plumber!

Baldy

hhmmm...I prolly shoulda done that when I did my swap...

j9fd3s

they dont want you pulling those apart, for some reason, i dunno why



mike