Can 66 'A' brakes be upgraded to the "improved" type?

[JAG]

Gray,
You are reading that correct - however you have to look at the applicability code for your serial number aircraft. If you are S/N 0001 thru 0525, your brake P/N is only 1241157-3. If you are after S/N 0525, then there are some options on the brakes once exhausted.

All that being said, physically, they are all identical. As near as I can tell, the 1241157-3 is a Cleveland 30-61 brake assembly. The B model and later with Brake C163030-405 is a Cleveland 30-61D brake assembly. I have attached the pages from the Parker parts breakdown, and the only difference I can find between these brakes, is the pistons are different (same size though) as they have a little spring on them. There is no difference in sizes, brake linings, etc, so my assessment is that there is no performance difference in these brakes, other than a small improvement on the piston to help keeping them from sticking...maybe?
Jeff