New User - Hi! and a question (master cyl)

[Andrew P.]

Hi All,

What a great site! Anyone from Fallbrook, CA. out there???

Anyway, I recently picked up a 64 convertible (327/250) from Detroit and am gathering the parts needed to replace the few mods done to it. The previous owner had the car converted to a dual braking system. Nice but not original so I'm reversing the decision.


Here's the question:

Before I received the car and in my ignorance, I picked up a master cyl from ebay that is a large unit, single line, and has twin spring-steel closures (that slip down over the sides of the reservoir) to secure the cap. The casting is stamped with 2225032. I'm now guessing that this is for the power brake option I don't have (my car was not optioned with PB's)...

Low and behold with the box of parts that was in the car's trunk was a much smaller, single line unit with a ridged (like ruffles have ridges) twist-to-close top. Casting number is 618081. Looks about right but then...

I browse ecklers to find that the unit they have as "correct" for the 64 is entirely different with a spring steel loop over the lid.

Any ideas what I've got here?

Thanks in advance guys (and gals)!

-Drew

[Timothy B.]

Re: New User - Hi! and a question (master cyl)

Andrew,

The only master cylinder with a screw on cap as you describe is for heavy duty brake package. I am not sure if it has two lines or one line to a distribution block. Don't throw it away and post a picture if you can.

I don't think it is correct for your car unless there is evidence of the H/D brake option.

[Stuart F.]

Re: New User - Hi! and a question (master cyl)

Sounds like the one shown in Eckler's with the bail spring is right for your car. It is also used as a replacement for 63's, such as the one put on mine when my 63 MC was stolen. It took me several years to find a correctly dated 63 MC to get mine back to original. I rebuilt the 64 unit and it's in my parts stock as a spare. What I don't know is whether the 64 units are dated in the same manner. There are so many out there as replacements. I'll take a look at it today to see. Also, you may want to check into what the "rule of thumb" is for date range for your car, i.e. how long in time the MC was built before your car was produced. Don't have that info close at hand.

Stu Fox

[Andrew P.]

Re: New User - Hi! and a question (master cyl)

Thanks Guys,

What would be other evidence of a HD brake package? What was included?

-AP

[Stuart F.]

Re: New User - Hi! and a question (master cyl)

I'm not sure what HD package Tim had in mind. I know the J56 option had a special MC, but about the only one you might see on yours with the 250 hp engine would be just the J65 Sintered Metallic brakes, and those came with power only in 64. There were only 29 sold w/J56 and they all came with the F.I. engine and 4-speed, where as there were 4,780 sold with J65, and they were available with all engine/trans packages. If somehow yours had J56, there would be other evidence too, besides the engine and trans - such as cooling ducts and the like.

Sounds like your spare MC is from a later (65-67) disc brake car, if indeed it is for a Corvette at all.

I would recommend you go after a standard "bail" top 64 MC w/i the correct date range if you are really intent on putting it back to stock - assuming you have all the other correct components including engine, trans, standard drum brakes, etc.

Stu Fox

[Timothy B.]

Re: New User - Hi! and a question (master cyl)

Andrew,

Stu is correct, for some reason I thought the HD brake package had a different M/C. I am thinking about all the Z-06 discussion in a previous thread.

[Joe L.]

Re: New User - Hi! and a question (master cyl)

Hi All,

What a great site! Anyone from Fallbrook, CA. out there???

Anyway, I recently picked up a 64 convertible (327/250) from Detroit and am gathering the parts needed to replace the few mods done to it. The previous owner had the car converted to a dual braking system. Nice but not original so I'm reversing the decision.


Here's the question:

Before I received the car and in my ignorance, I picked up a master cyl from ebay that is a large unit, single line, and has twin spring-steel closures (that slip down over the sides of the reservoir) to secure the cap. The casting is stamped with 2225032. I'm now guessing that this is for the power brake option I don't have (my car was not optioned with PB's)...

Low and behold with the box of parts that was in the car's trunk was a much smaller, single line unit with a ridged (like ruffles have ridges) twist-to-close top. Casting number is 618081. Looks about right but then...

I browse ecklers to find that the unit they have as "correct" for the 64 is entirely different with a spring steel loop over the lid.

Any ideas what I've got here?

Thanks in advance guys (and gals)!

-Drew

Drew-----


The master cylinder you have with the 2225032 casting number is the 65-66 standard brakes master cylinder. So, it's not correct for your 64 application although I think it could be used.

The correct master cylinder for your application will have the casting #5464264 and no bleeder valve. It will have a "domed style" cap with 2 bails that snap over the top.

The other master cylinder you have with the 618081 casting number is some sort of aftermarket piece. Based on your description, I don't think it's even for a Corvette.

[Stuart F.]

Re: New User - Hi! and a question (master cyl)

Joe;

I'm not sure what you are calling "Two Bails". I thought only the dual compartment MC's had 2 Bails. My 64 (spare) MC just has the one as it is only a single compartment (reservoir) with a single round cap. Looks just like my 63 except for that has the thumb screw cap and the 64 has the wire bail.

Stu Fox

[Joe L.]

Re: New User - Hi! and a question (master cyl)

Joe;

I'm not sure what you are calling "Two Bails". I thought only the dual compartment MC's had 2 Bails. My 64 (spare) MC just has the one as it is only a single compartment (reservoir) with a single round cap. Looks just like my 63 except for that has the thumb screw cap and the 64 has the wire bail.

Stu Fox

Stu-----


Yes, you're correct. There is just one bail on the 64 master cylinder that pivots up and snaps over the top. I was thinking there was a bail from either side but as I reflect on it, there's just the one.

[Stuart F.]

Re: New User - Hi! and a question (master cyl)

Joe;

Sorry. Didn't mean to question you. Just thought it best to set a new fellow on the right path. As always, you're the man!!

Have a good evening.

Stu Fox

[Joe L.]

Re: New User - Hi! and a question (master cyl)

Joe;

Sorry. Didn't mean to question you. Just thought it best to set a new fellow on the right path. As always, you're the man!!

Have a good evening.

Stu Fox

Stu-----


I take no offense, at all. If I'm incorrect, I want to know it.

[Andrew P.]

Re: New User - Hi! and a question (master cyl)

Thanks All!

Looks like I have one aftermarket and one 65-66. Ah well, ecklers at 75.00 is a fine option :-)

Thanks again for the help!

-Drew

[Rick S.]

Re: New User - Hi! and a question (master cyl)

Low and behold with the box of parts that was in the car's trunk was a much smaller, single line unit with a ridged (like ruffles have ridges) twist-to-close top. Casting number is 618081. Looks about right but then...

Drew,
Just so you understand, 1964 convertibles nor any C2 has a "trunk".

Have fun with your car,
Rick

[Stuart F.]

Re: New User - Hi! and a question (master cyl)

Right. It's a boot to boot.

Stu Fox

[Andrew P.]

Re: New User - Hi! and a question (master cyl)

Ahhh...you got me. I must have been thinking of my VIPER

-Drew