Author Topic: 9204 brake booster on ebay  (Read 6271 times)

Mike S

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Re: 9204 brake booster on ebay
« Reply #15 on: November 13, 2012, 10:20:52 PM »
 Hi Jerry,

  Are you sure? Those can't be 1/4" fonts. The pad itself is about 1/4" in height. I took a caliper out and measured my 8515 and early 9204 numbers at approximately .125" (~ 1/8") in height. Looking at later model booster I measured those smaller fonts at approximately .0635 (~ 1/16") height.

Mike
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Jerry@CHP

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Re: 9204 brake booster on ebay
« Reply #16 on: November 14, 2012, 06:57:38 PM »
You are correct, my mistake.

z28z11

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Re: 9204 brake booster on ebay
« Reply #17 on: November 19, 2012, 02:03:39 PM »
My 01C X77 booster (owned since 1973, removed from car in 1980) is dated "2" , 9204, small font, "Delco Morraine" upside down under the vacuum port , absolutely original to the car. Almost too good of shape to be sent out for replate - plating is faded but pretty decent (likely due to the fact it hasn't been on the car for 32 years).

Regards,
Steve
1968 Z28 M21/U17 BRG/W
1969 Z28 X77/M20/VE3 LeMans/W
1969 L78 X66/N66 Cortez/BVT
1969 Z11 L48/M35/C60/C06

Stingr69

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Re: 9204 brake booster on ebay
« Reply #18 on: November 19, 2012, 05:07:12 PM »
Another data point - My early '69 (10A) has the original master cylinder/cover and booster rebuilt by Steve Gregori. It does have the upside down Delco stamping but does not have the "9204" stamps - blank pads.

-Mark.

69Z28-RS

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Re: 9204 brake booster on ebay
« Reply #19 on: February 22, 2013, 08:43:57 PM »
I received my original booster back today, after rebuild by Steve Grigori (Brake Boosters, Inc).   he does a nice job for a very reasonable price.. I'm pleased.   and the stamped codes are much easier to read now after the cleaning and replating.   
My car is a late 09C car, with '9204' booster, date 199.   
Gary W / 09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe, '70 Mach I 
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NoYenko

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Re: 9204 brake booster on ebay
« Reply #20 on: February 22, 2013, 11:58:27 PM »
Another data point. Early 69 Nor 11A /Date stamp 310/Unit stamp 9204/Upside down Delco stamp. George

Mike S

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Re: 9204 brake booster on ebay
« Reply #21 on: February 23, 2013, 12:40:18 AM »
Gary & George,

  What size font for the Julian date? 1/16" or 2/16" ?

Thanks,
Mike
67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Restored

69Z28-RS

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Re: 9204 brake booster on ebay
« Reply #22 on: February 23, 2013, 03:53:29 AM »
I just went down and measured mine..    4/32"  or 1/8" ...   the julian date '199' is inverted (when top is up)..  '9204' is not inverted.
Gary W / 09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe, '70 Mach I 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

NoYenko

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Re: 9204 brake booster on ebay
« Reply #23 on: February 23, 2013, 08:06:49 PM »
Mike, My stamp was a double strike but it measures 1/8" both date and unit stamp. George

Mike S

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Re: 9204 brake booster on ebay
« Reply #24 on: February 23, 2013, 08:32:10 PM »
Excellent! That fills in the gaps and starts to show a pattern from the sample size below.

Late 1968
Trim Tag   Julian Date  Delco Stamp  Font size (1/8)
date      
shelf        334                    no      large
09C        199                   yes       large
10A        none                 yes       N/A
11A        310                   yes       large
      

1969        Julian Date   Delco Stamp  Font size (1/16)
Trim Tag
date
01C              002               yes      small
02D              055               yes      small
05A              120               no       small
06A              140               yes      small
07A              148               yes      small


 This sample size is showing that late 68 used the larger 1/8 font and in 1969 it switched to the smaller 1/16 fonts.
In regards to the Delco stamp, the 2 deviations in the list are from the booster I have on the shelf and the 05A booster.
    The one I have on the shelf may very well have had the front shell replaced when it was restored back in the 1980s when looks were more important than keeping numbers intact.
    The 05A booster *may* have had the shell replaced but I cant comment on that being its not mine and I dont know its history.
But the data here sure shows the smaller font began around the Jan 1969 period.

Thank you,
Mike
« Last Edit: February 23, 2013, 09:02:18 PM by Mike S »
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x77-69z28

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Re: 9204 brake booster on ebay
« Reply #25 on: February 23, 2013, 10:04:14 PM »
Mike, I wonder if it was lightly stamped and was cleaned up when the booster was restored? It is definitely original to the car.
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Mike S

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Re: 9204 brake booster on ebay
« Reply #26 on: February 23, 2013, 10:15:24 PM »
Mike, I wonder if it was lightly stamped and was cleaned up when the booster was restored? It is definitely original to the car.
  That could very well be the case. After I became more interested in this topic late last year I have looked at several original unrestored 69 boosters and many had such lightly stamped Delco markings that not all the characters were fully developed. So, if the metal is stripped down and polished during the restoration process then it's likely the remainder of the characters are removed.

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

69Z28-RS

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Re: 9204 brake booster on ebay
« Reply #27 on: February 24, 2013, 03:16:26 AM »
Mike,

My car is a LATE 09C (Sept 1969)..  I'm sorry if that throws a kink in your data.. :)
Gary W / 09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe, '70 Mach I 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

Mike S

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Re: 9204 brake booster on ebay
« Reply #28 on: February 24, 2013, 04:00:03 AM »

   If you are certain that is original to your car then that does throw a deviation in this for sure.  ???
Below is the updated list.

Late 1968
Trim Tag   Julian Date  Delco Stamp  Font size (1/8)
date     
shelf        334                    no      large
10A        none                 yes       N/A
11A        310                   yes       large
     

1969        Julian Date   Delco Stamp  Font size (1/16)
Trim Tag
date
01C              002               yes      small
02D              055               yes      small
05A              120               no       small
06A              140               yes      small
07A              148               yes      small
09C              199               yes      large
67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Restored

69Z28-RS

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Re: 9204 brake booster on ebay
« Reply #29 on: February 24, 2013, 05:27:46 AM »
TO my knowledge it has never been changed.   It was on the car when I bought it in 1976, and it's 'dated' appropriately for my 09C car??   but everything is speculation/educated guesswork after 44 yrs..  :)
Gary W / 09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe, '70 Mach I 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan