'63 Dart with four manual drum brakes.
I converted my single MC to a dual MC and I'm using the original push rod.
How do I know the original push rod is the correct length? I installed everything and there appears to be too much "slop" in the pedal. The pedal does not push tight against the brake light switch the way it did before I disassembled it.
Mancini makes an adjustable push rod that I might try.
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Push Rod Single to Dual Conversion