hydraulic fitting sealant

[Voyager]

After replacing my clutch slave cylinder this weekend, I’m getting a minor leak where the hydraulic hose screws into the slave. Can anyone recommend a sealant for the fitting threads?

[PeteF]

Loctite has one in a small tube, called thread sealant. Says used by OEMs. It's a white sealant and worked for me. I got it at NAPA.

[redmt]

Replace the fittings. Hydraulics fittings don't leak if they are in even reasonable shape. They are not designed for the use of a sealant like a pipe tapered fitting.

[DonC]

Another vote for replacing the fittings. They shouldn't leak if properly made and applied. If you're getting fluid out of the fittings, given the amount of pressure a hydraulic system creates, it's unlikely that thread sealant will correct the problem. I'm well aware that getting to some of the fittings can be a real nightmare but bite the bullet. When it comes to hydraulics you really want it done correctly.
DonC

[undy]

The fitting that "typically" threads into the slave is a pipe thread (where it threads into the slave). In that case, new or old fitting, use a teflon paste. Don't use Teflon tape as it tends to shread and enter the fluid stream.

There are "straight thread" fittings that use a copper crush ring or some type of o-ring but as far as clutch slaves they tend to be the exception, not the rule.

[Voyager]

Put the car back on jacks last night. The leak is coming from where the fitting screws into the slave. Can’t tighten the 90 degree elbow fitting anymore without getting a longer hydraulic line. Will get a new fitting, longer hydraulic line, and a backup slave (in case I’ve stripped the threads). Will also get some Teflon paste.

Thanks