Are brake master cylinders date coded?
#1
Burning Brakes
Thread Starter
Are brake master cylinders date coded?
My '66 appears to have the wrong brake master cylinder, as follows:
I understand that the '66 had a master cylinder that was unique to two years of production, I believe '65 and '66. Is this correct?
The correct part looks like this:
I am in no particular hurry to return this part to original but intend to be on the look out for the correct part. In doing so, I need to know whether the brake master cylinder for a '66 is date coded.
BTW. My car's build date is October 8, 1965
I understand that the '66 had a master cylinder that was unique to two years of production, I believe '65 and '66. Is this correct?
The correct part looks like this:
I am in no particular hurry to return this part to original but intend to be on the look out for the correct part. In doing so, I need to know whether the brake master cylinder for a '66 is date coded.
BTW. My car's build date is October 8, 1965
#3
Burning Brakes
Thread Starter
Thanks for confirming that. Are the castings for the '65-'66 model year dated? I don't want to go to the great expense of getting the proper part ($800 - $1,000) and not have the proper date. Are these castings dated?
#4
Race Director
The original casting number of the 65-66 power MCs is 5467084, and is found cast into the side of the MC. More important than the date on these MCs, is the brake line diameter. These master cylinders came in two versions. The first design one was used for part of 65, and used a 3/16" line. The second design MC, was used for the later part of 65, and all of 66. The later one uses 1/4" lines. There are no markings on the MCs to differentiate which line size the master cylinder is, so you have to be careful to make sure you get the 1/4" line one.
If you can find a good useable 65-66 power MC for $800-$1,000, grab it. The re-builders pay $1,000 for cores. The 65-66 PB MC's always need to be sleeved. A stainless steel sleeved rebuilt, without a core, will set you back about $1,500.
There is a repro coming, but I'm not sure if it's available yet. I think the price is supposed to be around $350?
#5
Burning Brakes
Thread Starter
Some MCs do have a date stamped on the flange, were they bolt to the booster. I don't recall if the 65-66 power MCs are dated though.
The original casting number of the 65-66 power MCs is 5467084, and is found cast into the side of the MC. More important than the date on these MCs, is the brake line diameter. These master cylinders came in two versions. The first design one was used for part of 65, and used a 3/16" line. The second design MC, was used for the later part of 65, and all of 66. The later one uses 1/4" lines. There are no markings on the MCs to differentiate which line size the master cylinder is, so you have to be careful to make sure you get the 1/4" line one.
If you can find a good useable 65-66 power MC for $800-$1,000, grab it. The re-builders pay $1,000 for cores. The 65-66 PB MC's always need to be sleeved. A stainless steel sleeved rebuilt, without a core, will set you back about $1,500.
There is a repro coming, but I'm not sure if it's available yet. I think the price is supposed to be around $350?
The original casting number of the 65-66 power MCs is 5467084, and is found cast into the side of the MC. More important than the date on these MCs, is the brake line diameter. These master cylinders came in two versions. The first design one was used for part of 65, and used a 3/16" line. The second design MC, was used for the later part of 65, and all of 66. The later one uses 1/4" lines. There are no markings on the MCs to differentiate which line size the master cylinder is, so you have to be careful to make sure you get the 1/4" line one.
If you can find a good useable 65-66 power MC for $800-$1,000, grab it. The re-builders pay $1,000 for cores. The 65-66 PB MC's always need to be sleeved. A stainless steel sleeved rebuilt, without a core, will set you back about $1,500.
There is a repro coming, but I'm not sure if it's available yet. I think the price is supposed to be around $350?
#6
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#7
Advanced
Master cylinder dates
The castings are Julian dated. The "date" is visable from the output line side of the housing. The attached show a "98" for example. The year is dictated by the size of the line.
[IMG][/IMG]
[IMG][/IMG]
#8
Burning Brakes
Thread Starter
#11
Burning Brakes
Thread Starter
Thanks bt. You learn something new every day. Here is the Julian Day calendar (for a non leap year), at least the part that would fit into my screen shot. From this you can see how 98 translates into April 8th:
#12
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Lone Star Corvette
1965 http://www.lonestarcaliper.com/ps-77...-cylinder.aspx
1966 http://www.lonestarcaliper.com/ps-78...-cylinder.aspx
call for price
1965 http://www.lonestarcaliper.com/ps-77...-cylinder.aspx
1966 http://www.lonestarcaliper.com/ps-78...-cylinder.aspx
call for price
#13
Burning Brakes
Thread Starter
Lone Star Corvette
1965 http://www.lonestarcaliper.com/ps-77...-cylinder.aspx
1966 http://www.lonestarcaliper.com/ps-78...-cylinder.aspx
call for price
1965 http://www.lonestarcaliper.com/ps-77...-cylinder.aspx
1966 http://www.lonestarcaliper.com/ps-78...-cylinder.aspx
call for price
#14
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I believe they are. when I looked at them At Corvettes At Carlisle you could get them without numbers or with. call and find out.
#15
Race Director
Lone Star Corvette
1965 http://www.lonestarcaliper.com/ps-77...-cylinder.aspx
1966 http://www.lonestarcaliper.com/ps-78...-cylinder.aspx
call for price
1965 http://www.lonestarcaliper.com/ps-77...-cylinder.aspx
1966 http://www.lonestarcaliper.com/ps-78...-cylinder.aspx
call for price
They're coming from Corvette Stainless Steel Brakes (CSSB) of Miami, FL. Their website says "Coming Soon". I thought that I got a flier or new wholesale catalog from them recently, with the price and availability, but I can't find it at the moment. I think these have the original GM numbers on them, but they may not have the Delco logo?
#16
Melting Slicks
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The CSSB GM-licensed/correct '65-'66 power master cylinders are $849.99.