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Engine Bay Heat
Dallas,
I had the issues you are dealing with on both my restorations.
Brake lock up ..... I reckon this is due to expansion of brake fluid - coming from engine bay heat. (I have no explanation for that flat towing lock up you mention) When it hapenned to me, I cracked a brake line connection and bled off "pressure" (when hot and locked). The wheels were then able to rotate and I could drive away. I did not re-bleed or re-adjust the brake system after this - the brakes work fine when cold and no longer locked up when hot.
When brake fluid heats up and expands, it puts a force against the wheel cylinders (no other place to go) and applies the brakes - in effect.
Vapor lock ..... I had hard starting after shutting the hot engine down - It would always start great when cold.
To slove this problem, I insulated the gas line between the fuel pump and carb with a rubber hose over the steel gas line and the wrapped with a foil reflecting tape. It starts much better now.
good luck.
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