4x4 Disc Brakes - Dialing In Discs
Calculate pedal ratio by dividing the pivot-to-pedal distance by the pivot-to-master measurement. A 5:1 ratio means that force is multiplied 5 times: 100 pounds of foot pressure creates 500 psi in the master cylinder. Manual systems are typically 5:1-6:1; power brakes have about a 3:1 ratio since the vacuum unit boosts the pressure. OE through-the-floorboard manual ratios are fixed; adjustable aftermarket setups are prevalent in the hot-rod world.
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