1965 Master Cylinder

[Ray C.]

I attempted to install the master cylinder on a late 65. The cylinder that was on the car when purchased was not the one listed in the Judging Guide. #2225032. I secured a rebuilt 1965 #2225032 master cylinder and tried to install it today. (Body drop on Monday) The studs that secure the master cylinder to the firewall did not align correctly with the cylinder. I did manage to get the cylinder secured to the firewall but I am not happy with the results. I have found that late cars sometimes have different components that the early cars. Could there have been a different master cylinder for late 65, or is there an instillation process that I am not following.

Thanks for any help
Ray

[Mike Sasser]

Re: 1965 Master Cylinder

My car is a late 65 (July23) and it has the 2225032 master cylinder also. I am in the process of a restoration too and will be doing a body drop soon, let me know how your body drop goes, how you did it and any problems you might have had. I haven't reinsalled my master cylinder yet but I don't anticipate any problems since I took it off the car.

[Loren L.]

1965 #23561 has exactly the master

cylinder described in the JG, bearing Julian date "239".

[Joe L.]

Re: 1965 Master Cylinder

Ray-----

Both 1965 and 1966 Corvettes with non-power brakes used the same master cylinder. So, it's virtually a certainty that the model changeover and possible use of the later model part on the earlier model car would have been moot in the case of this component.

One thing, though: the "2225032" is a Bendix casting number and not a GM number. It's possible that the same casting was used for more than 1 finished master cylinder. If so, just because you have the correct casting does not ensure that you have the correct master cylinder. I'm not saying that there was more than one finished master cylinder manufactured from this casting; I don't know for sure. But, it's a possibility if, indeed, the length between centerlines of the master cylinder mounting bolt holes is not correct on the cylinder you have purchased.

[Ray C.]

Re: 1965 Master Cylinder

Thanks! Joe

I would appreciate if you could answer one more question on this subject? If Bendix used the same casting number for different applications, would the appearance of the casting be the same. The master cylinder looks exactly the same as the one in the 65 AIM, and has all the casting numbers listed in the 65 JG. I have mounted the master cylinder on the firewall, but the studs angle in just a little. I would need to file or machine the outer edge of the holes on each side just a little to straighten the studs. What would be your opinion on this procedure?

Thanks Ray

[Joe L.]

Re: 1965 Master Cylinder

Ray-----

If the same casting were used for other master cylinders, the casting, itself, would appear the same for all master cylinders manufactured from the casting. Only the machining of the finished master cylinder (e.g. the mounting bolt hole configuration, etc.) would be different.

You probably could elongate the holes to fit. However, if the master cylinder is the correct one for your application, I don't see why you would need to do this. If it's an incorrect master cylinder and the only thing that it takes to make it work is the mounting hole elongation, then I'd say it would be fine. However, if the bolt hole difference is just ONE of more differences, then who knows?

[Ray C.]

Re: 1965 Master Cylinder

Thanks!

Ray

[Robert W.]

Re: 1965 Master Cylinder

Ray - Are the studs parallel or could one be bent causing the problem. I worked on a car once that had a similiar problem and straightening one stud and corrected it. I believe we hit it with the cyclinder off and setting the motor.

[Ray C.]

Re: 1965 Master Cylinder

Thanks! Robert

I now have the body secured to the frame and it is on the alignment lift in another shop. I hope to get it home by the weekend. I will check the mounting studs out then.

Thanks for the response!

Ray