Author Topic: Rear Brake Proportioning Valve Under Door - Date Code Question  (Read 7754 times)

camaronut

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Rear Brake Proportioning Valve Under Door - Date Code Question
« on: January 27, 2021, 05:03:33 PM »
Does the rear proportioning valve that is under the drivers door follow the same dating convention as everything else?
In other words, would this valve be dated a month or so prior to the build date?
Wondering, because these valves weren't used on every Camaro produced, therefore they weren't produced in the same quantities as alternators, water pumps, etc.
So it would seem that you could have a valve dated a few months prior to being installed on a car, therefore the question arises?  Is it original to the car?
Maybe they were all blank, then date stamped before installation?

In other words, you'd have an 04A car with a valve dated 072-0.

Possible?  Inquirng minds need to know!!!!
« Last Edit: January 27, 2021, 05:29:38 PM by camaronut »

x66 714

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Re: Rear Brake Proportioning Valve Under Door - Date Code Question
« Reply #1 on: January 27, 2021, 05:41:41 PM »
My original is 154-9, June 3rd. Car was built 8/29/1969 if that helps...Joe
See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO. Purchased March 1976
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E. Purchased April 1981

camaronut

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Re: Rear Brake Proportioning Valve Under Door - Date Code Question
« Reply #2 on: January 27, 2021, 06:29:44 PM »
Interesting - almost 2-1/2 months difference.
Thanks Joe!

BTW, I mean't to say 072-9, not 072-0.  My bad.
« Last Edit: January 27, 2021, 07:07:45 PM by camaronut »

ZLP955

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Re: Rear Brake Proportioning Valve Under Door - Date Code Question
« Reply #3 on: January 28, 2021, 04:04:10 AM »
My LA car is 04A, NCRS production date is April 3, 1969 and proportioning valve is dated 052-9. Thatís Feb 21.
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

169INDY

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Re: Rear Brake Proportioning Valve Under Door - Date Code Question
« Reply #4 on: January 28, 2021, 04:26:26 AM »
My (Z11) LA car is 04C, NCRS production date is April 21, 1969 and proportioning valve is dated 050-9.
Jim
68 SS/RS L35 Th-400 LOS
69 Pace Car L48 Th-350 LOS
68 Z28 M21 LOS

camaronut

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Re: Rear Brake Proportioning Valve Under Door - Date Code Question
« Reply #5 on: January 28, 2021, 04:04:48 PM »
At least we're consistant - but ony three cars / data points.

Anyone else???

copo

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Re: Rear Brake Proportioning Valve Under Door - Date Code Question
« Reply #6 on: January 28, 2021, 07:03:09 PM »
My car is NOR 06A, GM of Canada shipping date is June 24, 1969 and proportioning valve is dated 155-9.

uscrichter

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Re: Rear Brake Proportioning Valve Under Door - Date Code Question
« Reply #7 on: January 28, 2021, 09:02:05 PM »
I just checked mine, it's dated 128-9 and the car is 08C

69Z28-RS

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Re: Rear Brake Proportioning Valve Under Door - Date Code Question
« Reply #8 on: January 28, 2021, 09:47:26 PM »
My 09C Z28 (18 Sept 1969) has the proportioning valve:  KH   R   154 Ė 9   (3 June)
ie.   3 months prior to auto completion.   
09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette, '60 Corvette, '72 Corvette
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
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KurtS

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Re: Rear Brake Proportioning Valve Under Door - Date Code Question
« Reply #9 on: January 28, 2021, 09:51:22 PM »
Most are dated pretty close to the car.
At least 2 of the cars listed were in the extended model year and they were using up old material.
Kurt S
CRG

camaronut

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Re: Rear Brake Proportioning Valve Under Door - Date Code Question
« Reply #10 on: January 29, 2021, 12:08:30 AM »
Most are dated pretty close to the car.
At least 2 of the cars listed were in the extended model year and they were using up old material.
With all due respect, then itís possible that a 06A car could have a 027-9 valve?

Mike S

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Re: Rear Brake Proportioning Valve Under Door - Date Code Question
« Reply #11 on: January 29, 2021, 02:10:10 AM »
 Here are the following on my 67s
04B LOS- 75-7
05B NOR- 103-7

Mike
67 04B LOS SS/RS L35 Hardtop - Original w/UOIT
67 05B NOR SS/RS L35 Convertible - Restored

camaronut

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Re: Rear Brake Proportioning Valve Under Door - Date Code Question
« Reply #12 on: January 29, 2021, 01:15:01 PM »
Intersting results. 
Looks like we may have stumbled onto something out of the ordinary in terms of conventional date coding / car build on this particular part.
Hopefully we can get Jerry to chime in.

67CruiseMaster

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Re: Rear Brake Proportioning Valve Under Door - Date Code Question
« Reply #13 on: January 29, 2021, 02:18:41 PM »
My 09C build 67 Camaro has a date code 229-6. August 17th of 1966.
67 SS/RS with original Cruise Control
67 Tuxedo Black Convertible.

camaronut

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Re: Rear Brake Proportioning Valve Under Door - Date Code Question
« Reply #14 on: January 29, 2021, 09:27:47 PM »
Then is it possible that a 06A car could have a 027-9 valve?  Being such a late build car?
Thanks