Disk Brakes

Overview

Engineering reference data for Disk Brakes in automotive transport.

Key Formulas

Braking Distance

$d = \frac{v^2}{2\mu g}$

Distance to stop from velocity v.

Fuel Consumption

$FC = \frac{\text{distance}}{\text{fuel volume}}$

Distance per unit fuel.

Horsepower

$HP = \frac{\tau \cdot n}{5252}$

Torque × RPM / 5252.

Drag Force

$F_d = \frac{1}{2} \rho v^2 C_d A$

Aerodynamic drag on vehicle.

Variables

Symbol	Description	Unit
$d$	Braking distance	m
$v$	Velocity	m/s
$\mu$	Friction coefficient	—
$\tau$	Torque	N·m
$C_d$	Drag coefficient	—

Key Formulas

The primary equations governing disk brake performance are:

$$T = 2 \mu F r$$

where:

• $T$ is the braking torque (Nm).
• $\mu$ is the coefficient of friction.
• $F$ is the normal force applied to each pad (N).
• $r$ is the mean radius from the wheel center to the pad center (m).

The required pressure on the brake pad is calculated as:

$$p = \frac{F}{A}$$

where:

• $p$ is the contact pressure (Pa).
• $A$ is the area of the brake pad (m²).

References

• Original Source