Pedal Ratio Calculator

Pedal Ratio Formula:

\[ Ratio = \frac{Master\ Cylinder\ Bore^2}{Caliper\ Bore^2} \times Num\ Calipers \times Brake\ Pedal\ Ratio \]

Master Cylinder Bore:

inches

Caliper Bore:

inches

Number of Calipers:

count

Brake Pedal Ratio:

unitless

Ratio (unitless):

Unit Converter ▲

Unit Converter ▼

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1. What is the Pedal Ratio Calculator?

The Pedal Ratio Calculator determines the mechanical advantage in a brake system by calculating the ratio between master cylinder bore, caliper bore, number of calipers, and brake pedal ratio. This helps optimize braking performance and pedal feel.

2. How Does the Calculator Work?

The calculator uses the pedal ratio formula:

\[ Ratio = \frac{Master\ Cylinder\ Bore^2}{Caliper\ Bore^2} \times Num\ Calipers \times Brake\ Pedal\ Ratio \]

Where:

\( Master\ Cylinder\ Bore \) — Diameter of master cylinder in inches
\( Caliper\ Bore \) — Diameter of caliper piston in inches
\( Num\ Calipers \) — Number of calipers in the system
\( Brake\ Pedal\ Ratio \) — Mechanical advantage of brake pedal

Explanation: The formula calculates the overall mechanical advantage by considering the hydraulic advantage from bore ratios and the mechanical advantage from the pedal ratio.

3. Importance of Pedal Ratio Calculation

Details: Proper pedal ratio calculation is essential for designing brake systems with optimal pedal feel, braking force, and safety. It helps balance braking performance with driver comfort.

4. Using the Calculator

Tips: Enter master cylinder bore and caliper bore in inches, number of calipers as a whole number, and brake pedal ratio as a decimal. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical brake pedal ratio?
A: Most vehicles have brake pedal ratios between 4:1 and 6:1, with performance vehicles often using higher ratios for better mechanical advantage.

Q2: How does bore size affect braking?
A: Larger master cylinder bore requires more pedal force but provides more fluid volume, while smaller bore gives less pedal force but less volume.

Q3: What is the ideal pedal ratio?
A: Ideal ratio depends on the vehicle type and braking system. Higher ratios provide more mechanical advantage but can lead to longer pedal travel.

Q4: Can I use this for motorcycle brakes?
A: Yes, the same principles apply to motorcycle braking systems, though typical bore sizes and ratios may differ from automotive applications.

Q5: How does number of calipers affect the ratio?
A: More calipers increase the total piston area, which affects the hydraulic ratio and overall braking force distribution.