63 brake master cylinder need some education

[Donald A.]

Hello

new to the forum

I have a May 63 roadster and its now clear to me that the master cylinder has been replace at some point.

I would like to put the car back to a correct unit but I would like to learn what the proper way to do it.

1. Are these parts date coded and does that matter from a judging point of view

2. I find the usual parts sources have new ones to purchase but are these as original parts or cheap china crap?

3. Should I look for an origInal used one and can they be properly rebuilt.

Hoping there are many people on here who can shorten my learning curve on this subject

thanks

Don

[Joe L.]

Re: 63 brake master cylinder need some education

Hello

new to the forum

I have a May 63 roadster and its now clear to me that the master cylinder has been replace at some point.

I would like to put the car back to a correct unit but I would like to learn what the proper way to do it.

1. Are these parts date coded and does that matter from a judging point of view

2. I find the usual parts sources have new ones to purchase but are these as original parts or cheap china crap?

3. Should I look for an origInal used one and can they be properly rebuilt.

Hoping there are many people on here who can shorten my learning curve on this subject

thanks

Don

Don------

The 1963 master cylinder, GM casting #5462389, did have a casting date.

Most of the new master cylinders on the market will be aftermarket-type. They may or may not be manufactured off-shore. In any event, they will be configured somewhat different than originals. I'm not sure if there is currently an actual reproduction of this master cylinder. If there is, it will almost certainly be sourced from China.

A used original can be properly rebuilt with a stainless or brass sleeve. As such, it will essentially be as-new.

[Philip C.]

Re: 63 brake master cylinder need some education

Hi Don NCRS has great material on you car, a judging manual, it will tell you/show you a host of thing. Most of the answers to questions here, come from those manuals. By the way Happy 1st Anniversary. Phil 8063

[Ruedi K.]

Re: 63 brake master cylinder need some education

On my 63 Corvette there has been an incorrect reproduction brake master cylinder, so I bought an original one and had it restored. There are also some on Ebay, where you can see the date stamped and how they look. http://www.ebay.com/sch/i.html?_trks...at=0&_from=R40

[Joe R.]

Re: 63 brake master cylinder need some education

Donald,

Also, when looking for an original 63 that it will have 7/8 cast in the top front of the MC. Stands for 7/8" bore! I believe there are some 1" bores out there for passenger cars. They might have a different casting number but look similar from the top.

JR

[Gary F.]

Re: 63 brake master cylinder need some education

https://www.forums.ncrs.org/showthre...nder-date-code This previous thread may help.

[Donald A.]

Re: 63 brake master cylinder need some education

Thanks for all the posts. An excellent start for my search

[Donald A.]

Re: 63 brake master cylinder need some education

What about this

http://www.cssbinc.com/1963-corvette-master-cylinder-non-power.aspx

thoughts??

thanks

[Joe R.]

Re: 63 brake master cylinder need some education

Don,

That MC is a great replacement but won't stand up under the judging of the NCRS. That reproduction does not have a correct date cast in when it was made. From above and for a show car it's great!

JR

[Donald A.]

Re: 63 brake master cylinder need some education

Thanks JR for the response.

If my car is a May 63 build is there an acceptable date range that I should look for in an original?

i don't recall the judging manual stating this

Best

[Harry S.]

Re: 63 brake master cylinder need some education

Don, 63 MC's are one of the few parts that were made in batches. As I recall there were A53, A73 and something C?3. Saying that, any date that is within a 6 month range should be good. I didn't read through the entire thread, P/B or non-P/B?. They are identical except for the extra bleeder on the P/B cars. And yes, you can add the bleeder to a non-P/B and make it a P/B MC.

[Donald A.]

Re: 63 brake master cylinder need some education

My car is a non-power brake unit. Ok will start looking out for a unit within 6 month time frame.

For fun here is a pic of my car

[Donald A.]

Re: 63 brake master cylinder need some education

Don,

That MC is a great replacement but won't stand up under the judging of the NCRS. That reproduction does not have a correct date cast in when it was made. From above and for a show car it's great!

JR

JR and all.

Could anyone help me with the perspective of what JR is saying above.

If the MC is a correct looking replacement but does not have the date on it does that mean I lose so many points that it makes no sense to change it.

In the spirit of authenticity to return my car to as factory delivered isn't there some merit with having a correct looking part even if if does not have a date on it????

Just trying to learn here

thanks

[John H.]

Re: 63 brake master cylinder need some education

If the MC is a correct looking replacement but does not have the date on it does that mean I lose so many points that it makes no sense to change it.

In the spirit of authenticity to return my car to as factory delivered isn't there some merit with having a correct looking part even if if does not have a date on it????

Just trying to learn here

thanks

Donald -

Only a judge with a mirror would know the difference. The master cylinder is allocated 12 originality points (out of 4500 for the whole car), and the reproduction master would lose 4 or 5 points for Configuration and Date.

[Harry S.]

Re: 63 brake master cylinder need some education

Donald -

Only a judge with a mirror would know the difference. The master cylinder is allocated 12 originality points (out of 4500 for the whole car), and the reproduction master would lose 4 or 5 points for Configuration and Date.

I agree with John, 20% of the 12 for configuration and another 20% of the 12 for date. CDCIF math.