I am glad that you guys persuaded me to upgrade my car to the 1967 Mustang dual master cylinder and talked me through the conversion process. That was a huge improvement.
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The original manual drum brakes are adequate for a car in its stock configuration if they do not get wet, if you don't tail gate the car in front of you, and if you do not drive too fast. Making an emergency stop with drum brakes anywhere above 55 mph is an exciting experience.
The original 90, 101, and 164 horsepower engines were not very powerful and that in itself helped keep the speed within the design capacity of the original brakes. If you drop a bigger, heavier, higher-powered engine in the car, the original brakes will not be sufficient.
The six-cylinder Falcons had 9-inch drums and the 260 V-8 Falcons had 10-inch drums that were also used in the mid-sized V-8 Fairlanes. That is interesting because if the 10-inch brakes are barely marginal by today's standards in a Falcon, they would be even worse in the heavier Fairlane.
One thing that I do like about my drum brakes is the "squuuueeak" sound that they sometimes make when stopping at a red light. That squeak reminds me of elementary school and the sound that the school buses made when they stopped.
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