64.5 master cylinder and pushrod size

Lottawork

New Member
Jan 20, 2008
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I'm trying to rebuild the brake system on a 64.5 Mustang, manual drum brakes. I bought a new master cylinder and found that the pushrod from the brake pedal doesn't fit. I returned this master cylinder for another and got the same issue.

The master cylinder is the exact design of the one that came off it, but the hole in the cylinder is smaller. The rod I have seems to be the original, and worked on the original master cylinder. What gives? The design change?

The only rod the store could offer was the "adjustable" one that costs 65$, which is ridiculous. I just need a brake rod that fits the master cylinder. Oh, they don't sell one. There techies are looking into it, but I assume I'll not get an answer.

The cylinder is a 1" bore, and the tip of the rod is 7/16". The rod hits the bottom in the originally cylinder, but stops about 3/4 inch before the bottom on the new ones. I could grind down my rod (ha ha) to fit, but that shouldn't be the "right" answer to this problem. Can anybody else measure their rods (ha ha) and let me know? Thx.
 
keep getting rebult ones try asking for a 64 falcon sprint. 64.5 mustangs had wired parts. 65 master cylinder is different. I would personally go dual master cylinder and just redo the brake lines.