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Old 02-12-2018, 09:53 PM   #476
yelmer
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Re: The 1960 - 1966 Chevrolet & GMC Pickups Factory Correct Restoration Thread

i have never seen a date code on a booster . the master cylinder looks right some had screw on tops and some had clip on tops
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Old 02-12-2018, 09:58 PM   #477
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Re: The 1960 - 1966 Chevrolet & GMC Pickups Factory Correct Restoration Thread

Yelmer, Thanks. I am going to pull the booster this week. Will check for a date code, and post pictures if I find anything. Thanks again Frank
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Old 02-12-2018, 10:07 PM   #478
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Re: The 1960 - 1966 Chevrolet & GMC Pickups Factory Correct Restoration Thread

looks to be a date code on the master cylinder ?
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Old 02-12-2018, 10:14 PM   #479
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Re: The 1960 - 1966 Chevrolet & GMC Pickups Factory Correct Restoration Thread

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looks to be a date code on the master cylinder ?
Yes, there is a 66 cast in, and some faint”clocks” which probably indicate month/day. Need to find a source or someone who knows about the Bendix manufacturing process to confirm..
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Old 02-13-2018, 12:23 PM   #480
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Re: The 1960 - 1966 Chevrolet & GMC Pickups Factory Correct Restoration Thread

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1. The M/C has part number 618082 cast in the bottom and has a screw on cap. Is this potentially an original or replacement original?
I have that exact same 618082 master cylinder on several low mile trucks. 8700 mile 65 K20 , 18,000 mile 66 GMC , my gold 66 K20 22,000 mile truck. Thats two Janesville and one Flint built trucks. I've found these same master cylinders NOS on 64-66 Bendix boosters. I believe that master of yours IS correct and original for your truck . Ive sent mine out to Lone Star Calipers to have stainless steal sleeves installed and restored.
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Old 02-13-2018, 01:11 PM   #481
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Re: The 1960 - 1966 Chevrolet & GMC Pickups Factory Correct Restoration Thread

Yelmer , check your part number 3834112 , comes up as the rod assembly FOR the booster. The booster assembly is 3843823-assembly manual or 3848503 1966 parts book, for 1964-1966 and Bendix only.

More info on the 618082 master , this is the Bendix master cylinder, two companies were making master cylinders for GM at this time. The other was Delco / Moraine . Both are assembly line correct. Also look in the assembly manual , it shows the screw on top master cylinder. The date I believe is calendar days of the year out of 365 days ,yours 66th day of ? 1966 ? I have some with 146 and 277.
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Old 02-13-2018, 01:34 PM   #482
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Re: The 1960 - 1966 Chevrolet & GMC Pickups Factory Correct Restoration Thread

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Yelmer , check your part number 3834112 , comes up as the rod assembly FOR the booster. The booster assembly is 3843823-assembly manual or 3848503 1966 parts book, for 1964-1966 and Bendix only.

More info on the 618082 master , this is the Bendix master cylinder, two companies were making master cylinders for GM at this time. The other was Delco / Moraine . Both are assembly line correct. Also look in the assembly manual , it shows the screw on top master cylinder. The date I believe is calendar days of the year out of 365 days ,yours 66th day of ? 1966 ? I have some with 146 and 277.
Thanks for the info. Based on other parts and condition of this truck. I think the m/c and booster are original. Reading your last post, the 66 cast into the m/c is the day(s) cast? Are we thinking a Feb or March cast part? What is your thinking on the Bendix manufacturing timeline. Does the casting numbers start at calendar year or did it start with model year? Thanks again Frank

Last edited by f66; 02-13-2018 at 01:43 PM. Reason: Mis quoted
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Old 02-13-2018, 02:01 PM   #483
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Re: The 1960 - 1966 Chevrolet & GMC Pickups Factory Correct Restoration Thread

Look up, or google, Julian Date Calendar , it puts the date as March 7th for 066 . Its calendar year . GM used this method on other parts also. As far as how it relates , its always before or close to before the build date of the truck. Do you by chance have the build sheet to this truck ? The master cylinder would be on that sheet also.
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Old 02-13-2018, 02:23 PM   #484
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Re: The 1960 - 1966 Chevrolet & GMC Pickups Factory Correct Restoration Thread

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Look up, or google, Julian Date Calendar , it puts the date as March 7th for 066 . Its calendar year . GM used this method on other parts also. As far as how it relates , its always before or close to before the build date of the truck. Do you by chance have the build sheet to this truck ? The master cylinder would be on that sheet also.
Good info. I do have the build sheet (attached). Block 65, Brakes has 364. Does that correlate to anything? Is that the place that you are referring to on the build sheet?The March cast date seems good and accounts for time to machine, assemble, and ship to Fremont.
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Old 02-13-2018, 05:27 PM   #485
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Re: The 1960 - 1966 Chevrolet & GMC Pickups Factory Correct Restoration Thread

Well , generally thats the last three digits of the GM part number. I looked in several early books and still need to dig a little deeper. I have the number 360 in several other build sheets and those are Delco master cylinder trucks and found another with 364. I will keep searching. Just another tid bit , this same Bendix master cylinder was used on 1965 1966 Impalas and several other GM brands.
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