Thread: Fitting Wilwood RPV to 3/8" flared line

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Well if the only way to use these wilwood rpv's with AN fittings is to use sealer then that's good enough for me with my inverted flares. I'm tired of spending so if I can avoid $50 bucks on more residual pressure valves I will. Now the question is exactly what kind of sealer we are talking about here. Just any tube of "thread sealant"? any certain temperature rating or purpose exactly?

Originally Posted by 35fordcoupe

Well if the only way to use these wilwood rpv's with AN fittings is to use sealer then that's good enough for me with my inverted flares. I'm tired of spending so if I can avoid $50 bucks on more residual pressure valves I will. Now the question is exactly what kind of sealer we are talking about here. Just any tube of "thread sealant"? any certain temperature rating or purpose exactly?

You need adapter fittings - the Wilwood RPV's are NPT, not AN. While you can probably get the AN's started, they will never seal permanently and sealant is not the best way. It's a last resort on like fittings.

http://www.anplumbing.com/shop/index...op=&dept=Steel

Lots of bits and pieces shown here - and an easy site to navigate. A few bucks more on the right brake line fittings can save lives - and not a place I would scrimp.

I hear what you are saying Dave and I will not be sacrafising safety to save a few bucks, but I think you might be misunderstanding what I have exactly. I have 3/16 standard double flared lines with the adapter below into the npt wilwood rpv. Right now it leaks, but with a little sealant, which as I understand it is accepable, it should be fine. Does that sound ok?

http://www.speedwaymotors.com/Straig...ters,6463.html

You say it leaks, is the pipe thread leaking or the inverted flare connection?I want to get this straight.

You have Wilwood Residual Pressure Valves. The RPV's should have female 1/8" pipe thread. You will need adapters to tread into the RPV ends, they will have to be male 1/8" pipe to 3/16" @ 45 degrees inverted flare, since you are using 3/16 double flare, which I see you have. I have used teflon tape on my pipe threads with absolutely no problem and I know many other rodders that have done the same. There are several types of liquid (paste) types on the market, APR, makes one (my preference), can also get pipe thread sealant at your local hardware store or big box stores too. You do not want to put any sealer of any kind on the flare end fitting, they should seal by the connection alone. Hope I cleared up any confusion we may have caused.

Keith

You are confusing the fittings here i'm afraid, The Willwood valves are 1/8" NPT, you need either a 1/8" NPT to -3AN adaptor which uses a female tube nut and sleeve or you use a 1/8" NPT to 3/8" UNF Female adaptor which uses a 3/8" UNF Male tube nut, No sealer is needed although the 1/8" NPT to 3/8" UNF Female adaptor usually come with red sealer already on them.


1/8" NPT to -3AN adaptor



Use this tube nut & sleeve




1/8" NPT to 3/8" UNF Female adaptor



Use this 3/8" UNF male tube nut

Yes but only put the sealer on the thread a few threads in, that way you won't get sealer in the brake system. Do not put sealer on the first few threads.

Originally Posted by 35fordcoupe

I hear what you are saying Dave and I will not be sacrafising safety to save a few bucks, but I think you might be misunderstanding what I have exactly. I have 3/16 standard double flared lines with the adapter below into the npt wilwood rpv. Right now it leaks, but with a little sealant, which as I understand it is accepable, it should be fine. Does that sound ok?

http://www.speedwaymotors.com/Straig...ters,6463.html

Steve - you took the words right off of my fingertips (both fingers). Thanks!!

I hope he gets it.

Keith

I do believe that I get it. The pipe thread is leaking, 31 and what you say is exaclty what I have minus the sealer.

Steve- I have the "3/8" UNF male tube nut" into the "1/8" NPT to 3/8" UNF Female adaptor" into the residual pressure valve which is 1/8" NPT and I will put a little sealer a few threads in, but you say sealer is not necessary? All four of my adapter to rpv connections leak. I think I got it a couple posts ago because it seems to be exactly what I have, but I appreciate everyone taking me through this.

Originally Posted by 35fordcoupe

I do believe that I get it. The pipe thread is leaking, 31 and what you say is exaclty what I have minus the sealer.

Steve- I have the "3/8" UNF male tube nut" into the "1/8" NPT to 3/8" UNF Female adaptor" into the residual pressure valve which is 1/8" NPT and I will put a little sealer a few threads in, but you say sealer is not necessary? All four of my adapter to rpv connections leak. I think I got it a couple posts ago because it seems to be exactly what I have, but I appreciate everyone taking me through this.

Oh well - just make sure you give us an update with the 'fix'. These 'nigglers' are fun to talk through and most of us really like to spend other folks money as well.

Originally Posted by Hombre259

Fordcoupe, I am in the process of re-plumbing all of the hard brake lines on my truck. I converted it from a swing pedal brake firewall mounted booster and cylinder to a thru the floor master and clutch master cylinder. When I ordered my master cylinder and clutch master cylinder mount it came with residual valves for both the front and the rear brakes. A 2lb valve for the rear and a 10lb residual valve for the front, both of these valves are in fact "Inverted Flare" so they do make them.

If you need any pic's are the name of the supplier let me know. I am sure that you will find residual valves that take flared fittings as I have two of them.

Roland

The 10 pound is for the rear, the two pound for the front - you got it backwards.

well I guess I don't get it then or I am not explaining what I have well enough, but from what I can tell what I have is Steve's second option. Dave- I think you have me wrong here. I came here for help and appreciate what I am getting, but if I am not understanding quick enough I appologize..

I think you may need to tighten them more, According to the book NPT are self sealing, Most i do are self sealing but occasionally i get one that needs a touch of sealer. I never use the tape type as the paste is so much better.

Originally Posted by 35fordcoupe

I do believe that I get it. The pipe thread is leaking, 31 and what you say is exaclty what I have minus the sealer.

Steve- I have the "3/8" UNF male tube nut" into the "1/8" NPT to 3/8" UNF Female adaptor" into the residual pressure valve which is 1/8" NPT and I will put a little sealer a few threads in, but you say sealer is not necessary? All four of my adapter to rpv connections leak. I think I got it a couple posts ago because it seems to be exactly what I have, but I appreciate everyone taking me through this.

You have it right in these pics, next double flare the pipe and usea male 3/8" UNF tube nut and your there.

While we are talking flares in my opinion all brake lines should be double flared including stainless line, I believe its actually illegal here in the UK to single flare a brake line.
Single flares have a habit of cracking behind the flare where the double flares are much stronger due to the twin wall effect from double flaring.

Originally Posted by 35fordcoupe

well I guess I don't get it then or I am not explaining what I have well enough, but from what I can tell what I have is Steve's second option. Dave- I think you have me wrong here. I came here for help and appreciate what I am getting, but if I am not understanding quick enough I appologize..

Well spotted Paul, I hadn't noticed that

Just confirm 2lb for discs 10lb for drums.

Originally Posted by paul274854

The 10 pound is for the rear, the two pound for the front - you got it backwards.