Brake Bleeding Problems? Bleed screw won't close!

[Fiat88]

I'm still having trouble with bleeding the brakes as the new bleed screws won't thread all the way in and so I can't close them to stop the fluid from leaking out.

Here's the issues I'm experiencing, hope you guys can give me some advice on what could be the problem? I have the rear axle on jackstands as told to do to open the compensator.

Problems:
1) New bleed screws from IAP don't seem to be correct as they won't thread all the way in and when tightening them i can't get them to close the fluid off. I did check the part # with their website and it matches with what the sent me. The bag says Fiat, AR 164. They do look different them the original ones I took off.

2) I'm getting fluid to the rear passanger side caliper(furthest from the MC but none to the drivers side caliper.

3) I've tried the old bleed screw from the left rear caliper on the right rear caliper but I can't get it to close either and fluid still drips out.

4) How far is the bleed screw suppose to go as I can still see about 2-3 threads sticking out, its the furthest I can turn it?

Things I've changed:
New pads front and rear, 5 new rubber hoses, changed one metal brake line, rebuilt front calipers, rear calipers looked to be in good shape so I didn't rebuild them. I did screw the pistons in, and aligned the inscribed line which is on the piston face as I so in a thread, if I did that some how wrong would that stop the bleed screw from tightening down? Appreciate your responses.

I'm using one of those cheap bleed bottles which attaches to the caliper bleed screw.

[kmead]

Sounds like there is something wrong with the caliper. The end of the bleeder is intended to fill the small hole in the caliper at the bottom of the bleeder hole. If the caliper was redrilled during reconditioning due to a frozen in bleader, it may be off center, have the wrong angle or a variety of other seemingly minor variations from correct spec which means the bleeder will not seal the hole.

When you look down into the hole with the bleeder out, the small hole should be centered, have a conical chamfer around it and be clean and smooth. The hole should be quite small. Try measuring the depth of the conical chamfer compared to the bleeders you are using. A decent digital caliper at Harbor Freight won't cost much and makes measuring very easy.

I would look at returning the caliper if you find any defects in it.

[majicwrench]

If fluid still gushing out unimpeded, bleeder not in far enough. If just getting a seep when brakes under pressure, bleeder not seating well. If just seeping, try repeatedly loosening and tightening bleeder, this will help "form" the aluminum to the bleeder. Force is a bad thing here, just keep loosening and tightening.
ANd like was said, peer down into bleeder hole and make sure not somethign odd going on. SHould be nice clean taper.
Keith

[Fiat88]

I take it back the IAP screws seem to be the correct ones, my old rear passanger side caliper seems to be damaged. After a few tries at getting the caliper to stop leaking fluid by tightening and loosening the screw, it wouldn't stop. I then look down in the hole with a flash light and saw rust where the bottom of the bleeder sits, also the tiny hole is off-center. Going to autozone and buying a rebuilt for that side.

[Fiat88]

Ordered the caliper, gonna pick it up on the 14th from autozone.