Threshold braking or limit braking is a
driving
Driving is the controlled operation and movement of a vehicle, including cars, motorcycles, trucks, buses, and bicycles. Permission to drive on public highways is granted based on a set of conditions being met and drivers are required to ...
technique most commonly used in motor racing, but also practiced in road vehicles to slow a vehicle at the maximum rate using the brakes.
The technique involves the driver controlling the brake pedal (or lever) pressure to maximize the braking force developed by the
tires. The optimal amount of braking force is developed at the point when the wheel just begins to
slip.
Kinetic and static friction
Braking beyond the slipping point causes the tire to slide and the frictional adhesion between the tire and driving surface is reduced. The aim of threshold braking is to keep the amount of tire slip at the optimal amount, the value that produces the maximum frictional, and thus braking force. When wheels are slipping significantly (
kinetic friction), the amount of friction available for braking is typically substantially less than when the wheels are not slipping (
static friction
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction:
*Dry friction is a force that opposes the relative lateral motion of tw ...
), thereby reducing the braking force and eliminating steering ability. Peak friction occurs between the static and dynamic endpoints, and this is the point that threshold braking tries to maintain.
Other factors
Because available friction at a given moment depends on many factors including road surface material, temperature, tire rubber compound and wear, threshold braking is difficult to consistently achieve during normal driving.
See also
*
Anti-lock braking system
*
Cadence braking
*
Circle of forces
References
Driving techniques
Motorcycle dynamics
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