Pitlab77

iTrader: (3)

So finally got my car driving after a year. Trying to tackle some maintenance. Was trying to replace a vaccum line in the back of my intake manifold and found the part to be discontinued miata NC10-43-481.


43-481 on this picture. If i understand correctly there is a check valve but it is on the other side of the line 43-640 that connects to the brake booster. So I can replace this line with just a generic piece of hose. Fuel line or vacuum line. Is there a comparable line that will fit and is pre-shapped?

bahurd

iTrader: (8)

[QUOTE=Pitlab77;1522248]NC10-43-481.

/QUOTE]

Did you actually try and order one? $27.66 here: Part Number: NC1043481 and looks to be in stock.

HmoobDude

When I replaced mine, I just used some generic rubber hose I had laying around that I bought from McMaster-Carr. Haven't had any issues.

sometorque

iTrader: (1)

Yep. Been looking for one as well and it's NLA in most places. I was also looking for 43-640 for my MSM. I forget, but i believe one of the two hoses has a restrictor valve/pill in it. II'm assuming any old hose will work and you can just cut out the restrictor valve/pill from one hose to the other?

skylinecalvin

iTrader: (2)

The intake to firewall piping has a check valve. I bought a generic check valve off of summit racing and brake vaccum hose (thicker than normal vaccum line) to replace,

sometorque

iTrader: (1)

Yep. Couldn't remember which of the two has the check valve. Good to know a generic valve did the trick. Have to replace mine on the MSM since they're both pretty dry-rotted and I think there may be a small vac leak there.

skylinecalvin

iTrader: (2)

Make sure you orientate the check-valve correctly. The arrow should point towards the intake manifold.

Stock

Just went through this on my 95. 43-481 in just a molded rubber hose, nothing fancy past it's shape, it can be replaced with generic tubing. 43-640 is also molded but there's an internal check valve, don't replace that one with plain hose.

skylinecalvin

iTrader: (2)

I believe Stock is correct, it's different from '90-'2000 vs nb2's
https://www.ebay.com/itm/NEW-OEM-BRA...frcectupt=true

Pitlab77

iTrader: (3)

I tired ordering from a different ebay vendor but i was refunded the money today so I guess he didnt have the part.

I'll try the next two places and see. I'll probably just end up with a generic hose.

Also as far as I know the other end is still made and sold.

stevos555

The check valve should only be in the hose that runs from the IM to the hard line and not in the hose where the booster sits.

Stock

I think everyone in this thread would disagree... What year is your car?

Stock

The hose off the booster shows this:



The hose to the IM does not.

Squeeze the two hoses or better yet, blow in them - you'll quickly find out which has the check valve.

stevos555

I have a 97 and my check valve is in the IM to hard line hose not in the brake booster. Perhaps this hose will fit your NB

skylinecalvin

iTrader: (2)

I have an nb2 and my original hose had a check valve from firewall hard line to intake manifold

stevos555

It does not matter where the check valve resides as long as it's included between the vacuum produced by intake manifold and brake booster.
If one can't find a hose for the booster side, as long as you have one with a check valve on the IM, should be sufficient.

skylinecalvin

iTrader: (2)

oh, I know that but I don't want somebody that stumbles upon this page to accidently replace a hose without them confirming where the valve is.

Stock

Apologies, everyone that I've seen has had the valve in the hose off the booster...

Good point though, just squeeze the hoses to verify the location.

brainzata

iTrader: (4)

Nb's have the valve at the booster and Na's have it at the IM. If you want to replace either of these hoses you need to have reinforced brake booster hose, not some random rubber hose. If you need to delete the cross over metal tube- The dodge srt4/neon hose is cheap and perfect as for length, can be found on ebay. Saves space, weight and looks better imo.