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I just installed a set of speed bleeders in my '94 (SB1010), however on the rear calipers they stick out with threads showing about 1/4 inch. Is this normal? The front calipers are the C5 version and I put SB1010S on those and they fit flush. Anyone else have this problem?
So long as they function properly I'd say you're good to go. The part # seems correct and when "bottomed" they actually function and seal just like an OEM. A Russell application for the C4 says 33 mm long and yours mention 34.4. I would guess the extra threaded length would accomodate a caliper with a substantially deeper bleeder bore. Did you compare the two "side by side".
I'd be interested to know the overall length of what you removed from your "rears"!
After I took a second look at them they would seem to work fine as they did seal. I ended up removing them and replacing with OEM however because I just realized I cant do reverse bleeding with a phoenix injector with the lock valve the speed bleeders have. BTW I have never gotten a clutch to feel as good as it does now with that phoenix injector using RFI so I am looking forward to see how the brakes feel after I finish.