1966 Power Brake Master and Booster

[George D.]

Can anyone help shed some light on this?

Thanks,
George Dupont
#000764
Prosper, TX
georgee_dupont@yahoo.com

[Joe L.]

Re: 1966 Power Brake Master and Booster

The question that I have is the guy also included a Power Brake Booster that was installed with this master cylinder. However, he couldn’t guarantee me that the booster was actually off a 1966 Corvette. Are there any distinguishing markings/dates codes on the booster that would help me determine if it is indeed the correct booster for my 1966 L79 Coupe? The guy had it sand blasted and its condition is pretty good. If this is the right booster I can also have White Oak recondition this part.

Can anyone help shed some light on this?

Thanks,
George Dupont
#000764
Prosper, TX
georgee_dupont@yahoo.com

George----


1965-66 Corvette power boosters usually have a derivative of the part number stamped on one of the brake booster mounting brackets. This number is "7011". If you find that number stamped on one of the brackets, then you have the correct power booster. If you don't find that number you may still have the correct booster since I'm not sure that this number was stamped on every example of the GM #5467011 master cylinder ever made. Also, the 1967 booster, GM #5458832 which may or may not be stamped "8832", will SERVICE 1965-66 applications.

[Jim T.]

Re: 1966 Power Brake Master and Booster

A well known Corvette parts supplier Corvette Stainless Steel Brakes www.cssbinc.com with the help of GM and lots of well-invested research and development are offering a reproduction 64-67 power brake booster. They offer stamping a Julian date code behind the PN 7011. CSSB says their reproduction is a 100% correct replacement.

[George D.]

Re: 1966 Power Brake Master and Booster

Joe:

Thanks for the quick reply. I took a good look at the PB booster I bought this morning. The guy I bought it from unfortuantely had it sandblasted but that does make it easier to find markings, dates, etc.

I could not find any numbers or markings on the two booster to firewall mounting brackets themselves BUT two of the rear shell assembly tabs did have numbers on them. One tab had "7011" and another tab had "113".

Could this also be a place where the "7011" might be stamped?

Regards,
George

[George D.]

Re: 1966 Power Brake Master and Booster

Jim:

Thanks for the information. I took another look at my booster assembly and like I said "7011" is stamped on one of the tabs (ears) of the rear shell assembly BUT there is nothing stamped on the back side of this tab or any other one.

I'm guessing now that this is a "7011" booster and may be the orginal booster for my 1966 PB master cylinder. Unfortunately since it doesn't have a date stamp on it that I can find it may be a service replacement unit? I guess it's possible that not all boosters were date stamped but that may be wishful thinking on my part. The booster has been taken apart at one time. You can see the hammer/punch marks on the two ears with numbers on them which is done to separate the front half of the shell assembly from the rear.

[Joe L.]

Re: 1966 Power Brake Master and Booster

Joe:

Thanks for the quick reply. I took a good look at the PB booster I bought this morning. The guy I bought it from unfortuantely had it sandblasted but that does make it easier to find markings, dates, etc.

I could not find any numbers or markings on the two booster to firewall mounting brackets themselves BUT two of the rear shell assembly tabs did have numbers on them. One tab had "7011" and another tab had "113".

Could this also be a place where the "7011" might be stamped?

Regards,
George

George-----


I was mistaken about the location of the part number derivative. Somehow I had the recollection that the number was on the brackets but it's actually on a tab on the shell of the booster just as you've found. So, I'd say it's for sure that you have the correct booster.

[George D.]

Re: 1966 Power Brake Master and Booster

Joe:

Thanks for the confirmation! Someone was saying that on the back side of the tab on which the "7011" is would be a four digit date code such as "5865" (May 5, 1968). Is that correct? If so mine does not have any codes on the back of the "7011" tab. If the date code were supposedly on the back then I would assume that I have a service replacement?

[Joe L.]

Re: 1966 Power Brake Master and Booster

Joe:

Thanks for the confirmation! Someone was saying that on the back side of the tab on which the "7011" is would be a four digit date code such as "5865" (May 5, 1968). Is that correct? If so mine does not have any codes on the back of the "7011" tab. If the date code were supposedly on the back then I would assume that I have a service replacement?

George-----


Not necessarily. I would expect SERVICE pieces to have date codes, too, if the PRODUCTION pieces had them. It might just be that not all parts got the date codes. That's a good thing for you; it makes yours a "wild card"; you can date it as you wish.