Author Topic: Booster check valves  (Read 16737 times)

NoYenko

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Booster check valves
« on: November 18, 2014, 01:49:07 AM »
I was told at the Camaro Nationals I had the wrong check valve on my brake booster and I am confused on which one I need for an early 69 ( Nov 68 ) built car. In the photo #1 is what I had at the show, I thought it was original. #2 is on my friends 4-69 built car, #3 is what I have seen in some other posts on 68-69 cars. I couldn't find any discussions here so I thought I ask, what have you seen or know to be correct. George

Camarocards

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Re: Booster check valves
« Reply #1 on: November 18, 2014, 03:14:42 AM »
This is what I have on my 68 SS L35 which I believe to be original to the car.

Bob
Bob
'68 SS L35 01D

68camaroz28

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Re: Booster check valves
« Reply #2 on: November 18, 2014, 03:20:04 AM »
George, your #2 posted would be the correct one.
What Bob has is of course correct.
Oh, and the reason you see so many of the third picture you showed is due to that is what you normally get back on a restored booster.
Chick
68 Z/28 NOR 01B Orig motor/trans/rear
69 Z/28 NOR 07A Orig Block & GM Cross-ram/carbs
69 L34 Rest. Nova Father/Son Car
69 L78 Surv Nova Purch 4/69 31K miles
67 L89 Corv Tribute
68 Corv 427/400 Orig motor
07 Corv Z06
R 68Z build- http://www.camaros.net/forums/showthread.php?t=182584

68camaroz28

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Re: Booster check valves
« Reply #3 on: November 18, 2014, 03:57:29 AM »
George, some examples include this one on a Power Booster dated 5/31/68.

Late Dec67 built 68Z with the same valve.

Late 07D 68Z/28


I had posted this pic in my build thread showing what is normally seen in cars and had noted the middle one was correct. Check out post #814 http://www.camaros.net/forums/showthread.php?t=182584&page=55

Chick
68 Z/28 NOR 01B Orig motor/trans/rear
69 Z/28 NOR 07A Orig Block & GM Cross-ram/carbs
69 L34 Rest. Nova Father/Son Car
69 L78 Surv Nova Purch 4/69 31K miles
67 L89 Corv Tribute
68 Corv 427/400 Orig motor
07 Corv Z06
R 68Z build- http://www.camaros.net/forums/showthread.php?t=182584

NoYenko

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Re: Booster check valves
« Reply #4 on: November 19, 2014, 01:52:52 AM »
Guys thanks for the quick response, would anyone have an extra #2 check valve they would want to sell, send me a PM. Thanks. George

KurtS

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Re: Booster check valves
« Reply #5 on: November 19, 2014, 03:38:06 AM »
#2 is commonly seen, but again, there were multiple suppliers.
Kurt S
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68camaroz28

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Re: Booster check valves
« Reply #6 on: November 19, 2014, 12:17:26 PM »
#2 is commonly seen, but again, there were multiple suppliers.
Sure there were Kurt as just about everything else did but what did they look like? I've been looking for two plus years and only have noted the aforementioned #2 on cars that had a high degree of being un-molested. 
Chick
68 Z/28 NOR 01B Orig motor/trans/rear
69 Z/28 NOR 07A Orig Block & GM Cross-ram/carbs
69 L34 Rest. Nova Father/Son Car
69 L78 Surv Nova Purch 4/69 31K miles
67 L89 Corv Tribute
68 Corv 427/400 Orig motor
07 Corv Z06
R 68Z build- http://www.camaros.net/forums/showthread.php?t=182584

cook_dw

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Re: Booster check valves
« Reply #7 on: November 19, 2014, 12:53:11 PM »
Not that it matters but I have seen a few like the #3 (less than 5).  #1 never.  Most of the time its been #2.

KurtS

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Re: Booster check valves
« Reply #8 on: November 20, 2014, 02:48:12 AM »
I recall also seeing another design. I'll have to look.
#3 is from the 70's, IIRC.
Kurt S
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ZLP955

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Re: Booster check valves
« Reply #9 on: November 20, 2014, 09:45:46 AM »
Can originals be rebuilt, or are they non-serviceable?
Tim in Australia.
1969 04A Van Nuys Z/28. Cortez Silver, Dark Blue interior, VE3, Z21, Z23, D55/U17, D80, flat hood.
Sold at Clippinger Chevrolet in Covina, CA.
AHRA Formula Stock at Lions Dragstrip, NHRA E/MP at Pomona Raceway

Camarocards

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Re: Booster check valves
« Reply #10 on: November 20, 2014, 12:55:34 PM »
Inside of the check valve is a spring and rubber diaphragm. The ribbed cap is glued (epoxied) to the body capturing both the spring and diaphragm. There is no way to remove the ribbed cap without totally destroying it.

You might might, however, get lucky like what happened to me. The ribbed cap on my original valve was not epoxied very well and literally just fell apart. This happened about 25 years ago. I was silly enough to put the body and cap (the spring and diaphragm were long gone) in a zip lock bag and threw it in my parts stash. Fast forward 25 years. When I discovered that all of the reproductions are not manufactured to appear as the original, I purchased a reproduction valve. Using a Drexel tool I carefully cut off the cap on the reproduction valve, removed the spring and rubber diaphragm and then reassembled them into my original valve using super glue to adhere the cap to the body. It now looks correct and functions perfectly.

If you're looking for correctness in your restoration, your best best is to scour the junkyards and swap meets and take the route that I did.

Good luck,

Bob
Bob
'68 SS L35 01D

8ballracing

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Re: Booster check valves
« Reply #11 on: January 01, 2015, 04:45:07 PM »


From 1969 10E Z28 Hope it helps with the disscussion

melav8r

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Re: Booster check valves
« Reply #12 on: July 19, 2018, 07:20:45 PM »
I recall also seeing another design. I'll have to look.
#3 is from the 70's, IIRC.

Did you ever find a picture of the other design?

Pacecarjeff

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Re: Booster check valves
« Reply #13 on: December 04, 2018, 06:16:26 AM »
You can tell those guys at the Camaro Nationals that your check valve is perfectly correct for 1969.
There were like 6 different vendors making those for GM at the time.

Generally I like to see #2 on 67's and 68's as well as lots of different versions for those also. 1969s generally got the #1 in your pictures
There where many additional versions that are completely acceptable for all those model years.....
ie: Flat with diamond in center / Flat with no diamond, Ridged and tapered.

It was all a big transition during that period for that item.
The multiple circles #3 was adopted after 1974/5 or so.  And then there were a few versions of those also --the center circle got deeper.

I Have so many different designs of these things that It is clear that these were produced in HUGE quantities by many vendors simultaneously.
:)

m22mike

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Re: Booster check valves
« Reply #14 on: December 06, 2018, 02:19:33 AM »
IMO, #2 is the only assy line correct for 69. I have sourced a handful of the first one at a salvage yard from early/mid 70 cars, and as mentioned 3 is much later.
Mike
X66 L78 M22 4.10 Deluxe Threads, PNT 10/10, Red Hockey stripe