Home » Public Forums » GMCnet » Vacuum brake booster check valve.
| Vacuum brake booster check valve. [message #235507] |
Wed, 08 January 2014 14:18  |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Just finished installing a back-up vacuum pump for my brake booster. In order to keep leakage to a minimum, it is important that you use a good quality check valve in the booster. I tried two different brands. I got one off of the "Help" rack. I blew and sucked on 4 of them before I found one that would seal. Then I went to NAPA and got their part.....either #89000 or #1338..depending on how you read the box. It has a spring inside that slams the sealing flap closed to prevent leakage even at low differential pressures. So here are some pics to look at to help you identify a check valve that will work. Just what I found that works.
HTH someone.
http://www.gmcmhphotos.com/photos/g6505-brake-booster-check-valve.html
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
[Updated on: Thu, 09 January 2014 15:37] Report message to a moderator |
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| Re: Vacuum brake booster check valve. [message #235510 is a reply to message #235508] |
Wed, 08 January 2014 15:05  |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Yup, good suggestion. The old ones off of an older GM car seem to work better than the new ones. I needed two of them and actually found one old one in one if a dozen 5qt pails of nuts, bolts and spare parts that I've accumulated over the 40 some years that I have been doing this. Don't know how old it is or what it came off of, but it works better than the "Help" rack check valves. IMO, the Help Rack check valves are just a piece of junk, not worth the plastic they are made of. JMHO
| Jim Wagner wrote on Wed, 08 January 2014 14:55 |
Larry,
I ran into the same problem when I did ours. My solution was to get some from the local Pull-a-Part. I didn't think to look for a spring but the ones I found were good.
Jim Wagner
76 500GMC GB
69 383Corvette
71 355Vega
Brook Park, oh
Just finished installing a back-up vacuum pump for my brake booster. In order to keep leakage to a minimum, it is important that you use a good quality check valve in the booster. I tried two different brands. I got one off of the "Help" rack. I blew and sucked on 4 of them before I found one that would seal. Then I went to NAPA and got their part.....either #39000 or #1338..depending on how you read the box. It has a spring inside that slams the sealing flap closed to prevent leakage even at low differential pressures. So here are some pics to look at to help you identify a check valve that will work. Just what I found that works.
HTH someone.
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Larry
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: Vacuum brake booster check valve. [message #235512 is a reply to message #235507] |
Wed, 08 January 2014 15:29 |
Ultravan Owners
Messages: 443
Registered: March 2013
Karma: 0
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Larry,
That is good to know. Thank you for sharing the information.
Tony (Ontario Canada)
Marie and I are blessed to have had a 2nd chance to buy our farm.
Still hoping and more importantly praying to be able to build a garage.
Our 1970 Ultravan #520 has an Olds Toronado 455 in back.
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| Re: [GMCnet] Vacuum brake booster check valve. [message #235529 is a reply to message #235510] |
Wed, 08 January 2014 18:02 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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That's exactly the conclusion I reached back when I was making PVC vacuum
reservoirs for sale: The Help check valves leaked at least 20% of the
time. Don't think I ever found a bad one in a junkyard. I distinctly
remember one car that had obviously been junked long before -- probaby 6+
months. When I pulled the check valve there was a loud 'swoosh" of
entering air to replace the vacuum held all that time. Good stuff. :-)
Ken H.
On Wed, Jan 8, 2014 at 4:05 PM, Larry wrote:
>
>
> Yup, good suggestion. The old ones off of an older GM car seem to work
> better than the new ones. I needed two of them and actually found one old
> one in one if a dozen 5qt pails of nuts, bolts and spare parts that I've
> accumulated over the 40 some years that I have been doing this. Don't know
> how old it is or what it came off of, but it works better than the "Help"
> rack check valves. IMO, the Help Rack check valves are just a piece of
> junk, not worth the plastic they are made of. JMHO
>
>
> Jim Wagner wrote on Wed, 08 January 2014 14:55
> > Larry,
> > I ran into the same problem when I did ours. My solution was to get some
> from the local Pull-a-Part. I didn't think to look for a spring but the
> ones I found were good.
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Vacuum brake booster check valve. [message #235532 is a reply to message #235507] |
Wed, 08 January 2014 18:11 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Larry,
The NAPA Online parts search SUCKS!
I entered 39000 - nothing
I entered 1338 - nothing
I entered Check Valve - search came back with:
Were you looking for:
Category > Exhaust Air Check Valve
Category > Exhaust Air Check Valve
Category > Power Brake Booster Check Valve
I clicked on: Category > Power Brake Booster Check Valve
The first check valve that popped up was:
http://www.napaonline.com/Catalog/CatalogItemDetail.aspx/Power-Brake-Booster-Check-Valve/_/R-UBP89000_0063327786
For the hell of it I searched for UP39000 - nothing!
I tried UP 39000 - nothing!
Regards,
Rob M.
Sydney, Australia
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Larry
Sent: Thursday, January 09, 2014 7:19 AM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] Vacuum brake booster check valve.
Just finished installing a back-up vacuum pump for my brake booster. In order to keep leakage to a minimum, it is important that you
use a good quality check valve in the booster. I tried two different brands. I got one off of the "Help" rack. I blew and sucked on
4 of them before I found one that would seal. Then I went to NAPA and got their part.....either #39000 or #1338..depending on how
you read the box. It has a spring inside that slams the sealing flap closed to prevent leakage even at low differential pressures.
So here are some pics to look at to help you identify a check valve that will work. Just what I found that works.
HTH someone.
http://www.gmcmhphotos.com/photos/g6505-brake-booster-check-valve.html
--
Larry :)
78 Royale w/500 Caddy
Menomonie, WI.
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Vacuum brake booster check valve. [message #235541 is a reply to message #235535] |
Wed, 08 January 2014 19:03 |
kincaid76royale
Messages: 71
Registered: February 2005
Karma: 0
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----- Original Message -----
From: "Larry" <weidnerl@wwt.net>
To: gmclist@temp.gmcnet.org
Sent: Wednesday, January 8, 2014 4:29:08 PM
Subject: Re: [GMCnet] Vacuum brake booster check valve.
Robert Mueller wrote on Wed, 08 January 2014 18:11
> Larry,
>
> The NAPA Online parts search SUCKS!
>
> I entered 39000 - nothing
> I entered 1338 - nothing
> I entered Check Valve - search came back with:
>
> Were you looking for:
> Category > Exhaust Air Check Valve
> Category > Exhaust Air Check Valve
> Category > Power Brake Booster Check Valve
>
> I clicked on: Category > Power Brake Booster Check Valve
>
> The first check valve that popped up was:
>
> http://www.napaonline.com/Catalog/CatalogItemDetail.aspx/Power-Brake-Booster-Check-Valve/_/R-UBP89000_0063327786
>
> For the hell of it I searched for UP39000 - nothing!
> I tried UP 39000 - nothing!
>
> Regards,
> Rob M.
> Sydney, Australia
>
Well, at least we have an URL that will take us to the part. Thanks.
--
Larry :)
78 Royale w/500 Caddy
Menomonie, WI.
Hi All:
Last year I had the inlet hose end of the check valve on my sensitized booster break off, leaving me almost without brakes. Fortunately I was just leaving home and didn't hit anything until I got the coach stopped. I did, however, roll downhill, right through two stop signs. I was able to get a NOS replacement at a Chevrolet dealer. The part No. is: 18021981 Valve kit...........List $ 27.11
Jack Kincaid, Castro Valley, CA
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| Re: [GMCnet] Vacuum brake booster check valve. [message #235542 is a reply to message #235541] |
Wed, 08 January 2014 19:08 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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| kincaid76royale wrote on Wed, 08 January 2014 19:03 |
Hi All:
Last year I had the inlet hose end of the check valve on my sensitized booster break off, leaving me almost without brakes. Fortunately I was just leaving home and didn't hit anything until I got the coach stopped. I did, however, roll downhill, right through two stop signs. I was able to get a NOS replacement at a Chevrolet dealer. The part No. is: 18021981 Valve kit...........List $ 27.11
Jack Kincaid, Castro Valley, CA
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Good find...I'll list that # in theCheck valve album. Thanks.
Larry
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Vacuum brake booster check valve. [message #235550 is a reply to message #235541] |
Wed, 08 January 2014 20:21 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Jack,
The valves from NAPA are $8.79!
Regards,
Rob M.
-----Original Message-----
From: kincaid76royale@comcast.net
Hi All:
Last year I had the inlet hose end of the check valve on my sensitized booster break off, leaving me almost without brakes.
Fortunately I was just leaving home and didn't hit anything until I got the coach stopped. I did, however, roll downhill, right
through two stop signs. I was able to get a NOS replacement at a Chevrolet dealer. The part No. is: 18021981 Valve
kit...........List $ 27.11
Jack Kincaid
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Vacuum brake booster check valve. [message #235556 is a reply to message #235535] |
Wed, 08 January 2014 20:57 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Senior Member |
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Rob,
Since the link you showed called for part # 89000, did you try that?
Gary Kosier
-----Original Message-----
From: Larry
Sent: Wednesday, January 08, 2014 7:29 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Vacuum brake booster check valve.
Robert Mueller wrote on Wed, 08 January 2014 18:11
> Larry,
>
> The NAPA Online parts search SUCKS!
>
> I entered 39000 - nothing
> I entered 1338 - nothing
> I entered Check Valve - search came back with:
>
> Were you looking for:
> Category > Exhaust Air Check Valve
> Category > Exhaust Air Check Valve
> Category > Power Brake Booster Check Valve
>
> I clicked on: Category > Power Brake Booster Check Valve
>
> The first check valve that popped up was:
>
> http://www.napaonline.com/Catalog/CatalogItemDetail.aspx/Power-Brake-Booster-Check-Valve/_/R-UBP89000_0063327786
>
> For the hell of it I searched for UP39000 - nothing!
> I tried UP 39000 - nothing!
>
> Regards,
> Rob M.
> Sydney, Australia
>
Well, at least we have an URL that will take us to the part. Thanks.
--
Larry :)
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Vacuum brake booster check valve. [message #235567 is a reply to message #235561] |
Thu, 09 January 2014 05:05 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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| Larry wrote on Wed, 08 January 2014 23:41 |
| Robert Mueller wrote on Wed, 08 January 2014 21:34 |
Gary,
Well it looks like the problems I had with this is not Dan's fault!
It's bloody Larry's fault - partially! He noted; "Then I went to NAPA and got their part.....either #39000 or #1338.depending on how
you read the box"
|
Aw crap!! I've been doing a lot of that lately....I mean a 3 is not even close on the keyboard to an 8, or I could claim simple typo. Sorry boys. At least the Photosite #'s are correct....
|
All of this time I thought it was Rob reading the numbers upside down and right to left.
Larry, you can go back to your postings and edit them to correct the numbers.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Vacuum brake booster check valve. [message #235568 is a reply to message #235556] |
Thu, 09 January 2014 05:55 |
Jim Bounds
Messages: 842
Registered: January 2004
Karma: 0
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Senior Member |
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The link is the right one but you can find it at most any auto parts store, just say you need a GM style vacuum booster check valve from any 70's vehicle. You could carry in the check valve on your coach as a sample-- it's exactly the same part-- no reason to do a hard search, and that is the only part you will need-- well you would also need a barbed double male reducer from the large outlet on the check valve to the 3/8 other end of the valve. All the rest of the vacuum hose is all 3/8"
If you have any other questions concerning the system let me know, I'm happy more folks are preparing their coach with countermeasures. I feel it's really important,
Jim Bounds
-----------------------------
Jim Bounds
-----------------------------
On Wednesday, January 8, 2014 9:57 PM, Kosier <gkosier@roadrunner.com> wrote:
Rob,
Since the link you showed called for part # 89000, did you try that?
Gary Kosier
-----Original Message-----
From: Larry
Sent: Wednesday, January 08, 2014 7:29 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Vacuum brake booster check valve.
Robert Mueller wrote on Wed, 08 January 2014 18:11
> Larry,
>
> The NAPA Online parts search SUCKS!
>
> I entered 39000 - nothing
> I entered 1338 - nothing
> I entered Check Valve - search came back with:
>
> Were you looking for:
> Category > Exhaust Air Check Valve
> Category > Exhaust Air Check Valve
> Category > Power Brake Booster Check Valve
>
> I clicked on: Category > Power Brake Booster Check Valve
>
> The first check valve that popped up was:
>
> http://www.napaonline.com/Catalog/CatalogItemDetail.aspx/Power-Brake-Booster-Check-Valve/_/R-UBP89000_0063327786
>
> For the hell of it I searched for UP39000 - nothing!
> I tried UP 39000 - nothing!
>
> Regards,
> Rob M.
> Sydney, Australia
>
Well, at least we have an URL that will take us to the part. Thanks.
--
Larry :)
78 Royale w/500 Caddy
Menomonie, WI.
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