JL8 caliper adapter fittings leaking - Team Camaro Tech
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post #1 of 16 (permalink) Old Jun 13th, 10, 09:23 PM Thread Starter
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JL8 caliper adapter fittings leaking

What do you do to get the JL8 caliper adapter fittings from leaking? They fit into the caliper; I have the crush washer on and can't tighten them anymore. Thanks for your help.

Last edited by rsb0719; Jun 19th, 14 at 05:39 PM.
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post #2 of 16 (permalink) Old Jun 14th, 10, 02:41 PM
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Re: JL8 caliper adapter fittings leaking

I don't know anything about JL8 brakes, but that looks like the male thread is pipe thread, and the female (can't see, but guessing) looks like it might be inverted flare. If I'm correct, use teflon thread sealing paste on the male threads of that fitting you show, and nothing on the flare fitting side of things. Just from the looks of the picture you posted, that doesn't look like it was intended to be used with a copper washer. And I could be totally wrong.


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post #3 of 16 (permalink) Old Jun 14th, 10, 06:58 PM Thread Starter
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Re: JL8 caliper adapter fittings leaking

Quote:
Originally Posted by BPOS View Post
I don't know anything about JL8 brakes, but that looks like the male thread is pipe thread, and the female (can't see, but guessing) looks like it might be inverted flare. If I'm correct, use teflon thread sealing paste on the male threads of that fitting you show, and nothing on the flare fitting side of things. Just from the looks of the picture you posted, that doesn't look like it was intended to be used with a copper washer. And I could be totally wrong.
Thanks for your reply, and you are correct the male is a pipe thread which is where I am having the problem the other end is inverted flare and is fine, it doesn't leak. It only leaks on the male side. I will try the teflon sealing paste and not use the copper washer to see what happens. Thanks again.
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post #4 of 16 (permalink) Old Jun 16th, 10, 02:03 PM
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Re: JL8 caliper adapter fittings leaking

A copper washer would not be used on a pipe thread fitting. It would be used on a banjo bolt adapter and that is what yours looks like. Pipe threads are tapered, a Banjo bolt is not, banjo bolts use fine thread bolt threads.
Make sure your adapter is not bottoming out, and that the copper washer has a flat clean machined surface to seal on.
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post #5 of 16 (permalink) Old Jun 16th, 10, 04:22 PM Thread Starter
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Re: JL8 caliper adapter fittings leaking

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Originally Posted by davidpozzi View Post
A copper washer would not be used on a pipe thread fitting. It would be used on a banjo bolt adapter and that is what yours looks like. Pipe threads are tapered, a Banjo bolt is not, banjo bolts use fine thread bolt threads.
Make sure your adapter is not bottoming out, and that the copper washer has a flat clean machined surface to seal on.
David
No it isn't a banjo bolt adapter; they are not use on the JL8 setup. These brake lines fit into the adapter; the green and red side attach to the adapter on one side which is fine and don't leak. The other end of the line attaches to the rubber brake hose. The brass adapter goes directly into the brake caliper which it the part that leaks.

David, I read through your website; it a great site; learn alot from there.

Last edited by rsb0719; Jun 19th, 14 at 05:39 PM.
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post #6 of 16 (permalink) Old Jun 16th, 10, 04:37 PM
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Re: JL8 caliper adapter fittings leaking

It it's pipe thread the teflon paste (pipe dope) should seal it fine, UNLESS the female threads were tapped too deep. Pipe threads are a tapered thread, and if the the tap is run in too deep you lose the taper on the female side and lose the interference fit. I hope that's not the case with yours.


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post #7 of 16 (permalink) Old Jun 17th, 10, 04:23 PM Thread Starter
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Re: JL8 caliper adapter fittings leaking

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Originally Posted by BPOS View Post
It it's pipe thread the teflon paste (pipe dope) should seal it fine, UNLESS the female threads were tapped too deep. Pipe threads are a tapered thread, and if the the tap is run in too deep you lose the taper on the female side and lose the interference fit. I hope that's not the case with yours.
I going to try your suggestion this weekend if I can find the teflon paste; I understand that T+2 Rectorseal is real good for this purpose. If that does not work, since JL8 calipers are no more than corvette type calipers, maybe I can get the front corvette brake hose that screws directly into the caliper. Thanks again to the team members with their help.
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post #8 of 16 (permalink) Old Sep 1st, 10, 08:38 PM Thread Starter
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Unhappy Re: JL8 caliper adapter fittings leaking

Quote:
Originally Posted by BPOS View Post
It it's pipe thread the teflon paste (pipe dope) should seal it fine, UNLESS the female threads were tapped too deep. Pipe threads are a tapered thread, and if the the tap is run in too deep you lose the taper on the female side and lose the interference fit. I hope that's not the case with yours.
It's been awhile, but the problem is exactly what BPOS said the female threads were tapped too deep and the taper on the female side is loss. Now I wonder how it can be fixed or can it be fixed at all. These calipers were very expensive so I hate to have to buy more. It has been suggested to use red loctite, I guess that is the next step. Any other suggestions are welcome. Thanks to everyone.
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post #9 of 16 (permalink) Old Sep 1st, 10, 09:41 PM
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Re: JL8 caliper adapter fittings leaking

Bummer....

a couple thoughts:

1. Send it back for a refund!!

2. Drill and tap it to the next NPT size, but that might be too big.

3. Have a machinist drill, tap and spot face it for a banjo type/crush washer fitting.

4. Weld it up and redrill & retap with correct NPT thread. Assuming it's cast iron, make sure your welder guy knows what he's doing.


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post #10 of 16 (permalink) Old Sep 2nd, 10, 12:59 AM
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Re: JL8 caliper adapter fittings leaking

Did you have someone look at it?
If not, take all your fittings and calipers to a good hydraulics store and perhaps they can come up with something. The fitting in the photo has straight threads, if it were pipe it would have tapered threads.
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post #11 of 16 (permalink) Old Sep 2nd, 10, 07:14 AM
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Re: JL8 caliper adapter fittings leaking

He's got a true Corvette caliper with straight threads intended for a banjo fitting and NOT a JL8 caliper with the pipe thread fitting.

He needs to get a correct JL8 caliper. Return the caliper for the right one.

Or, as he suggested, just use a Corvette banjo flex hose and call it even.

Also, I was under the assumption that you NEVER use teflon tape to seal ANY brake fitting.
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post #12 of 16 (permalink) Old Sep 2nd, 10, 09:53 AM
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Re: JL8 caliper adapter fittings leaking

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Originally Posted by mahunt View Post

Also, I was under the assumption that you NEVER use teflon tape to seal ANY brake fitting.
I wouldn't use teflon tape either, but some brake fittings are pipe thread, and they need a sealant - I use teflon pipe dope. I believe (though I don't own them) that some Wilwood calipers use pipe fittings at the caliper. My SSBC proportioning valve uses pipe thread fittings.


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post #13 of 16 (permalink) Old Sep 2nd, 10, 09:14 PM Thread Starter
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Re: JL8 caliper adapter fittings leaking

Quote:
Originally Posted by davidpozzi View Post
Did you have someone look at it?
If not, take all your fittings and calipers to a good hydraulics store and perhaps they can come up with something. The fitting in the photo has straight threads, if it were pipe it would have tapered threads.
David
Quote:
Originally Posted by mahunt View Post
He's got a true Corvette caliper with straight threads intended for a banjo fitting and NOT a JL8 caliper with the pipe thread fitting.

He needs to get a correct JL8 caliper. Return the caliper for the right one.

Or, as he suggested, just use a Corvette banjo flex hose and call it even.

Also, I was under the assumption that you NEVER use teflon tape to seal ANY brake fitting.
Thanks for all your replies; first I will take them as David suggest to a hydraulic store and see what they suggest. If they have no suggestions than I will try the Corvette banjo flex hose.

mahunt said I may have true Corvette calipers; here are the numbers on the calipers, 5469588, the other has 5469589. Both have 5465952 on the other side the calipers. My understanding from the books I read these are JL8 calipers. I could be wrong. My 12 bolt rearend has a QX code, probably and over the counter item.
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post #14 of 16 (permalink) Old Sep 3rd, 10, 07:19 AM
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Re: JL8 caliper adapter fittings leaking

The casting may be correct for JL8, but is sure sounds like one was drilled for straight threads and not pipe.

Or maybe it's just stripped.

Look at the threads and make your determination (straight, pipe or stripped) or run a regular banjo bolt into the hole and see what's up (does it wiggle three threads in or is it going in like a regular straight bolt).
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post #15 of 16 (permalink) Old Sep 3rd, 10, 04:14 PM Thread Starter
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Re: JL8 caliper adapter fittings leaking

Quote:
Originally Posted by mahunt View Post
The casting may be correct for JL8, but is sure sounds like one was drilled for straight threads and not pipe.

Or maybe it's just stripped.

Look at the threads and make your determination (straight, pipe or stripped) or run a regular banjo bolt into the hole and see what's up (does it wiggle three threads in or is it going in like a regular straight bolt).
It appears to be straight, the threads are not stripped. I will have to go pick up a banjo bolt to see what it does. I tried a 68-82 Corvette brake hose and it leaks too (not the banjo type but the straight type), besides metal stem is too long hits the stablizer bar. I going to take the caliper with me to an auto parts store to check out the banjo type.
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