Road Surface Friction Control

The road surface is a replaceable 120grit 3Mite

A speed controlled roller brush sweeps the road surface during testing. The brushes position is electronically controlled to a prescribed contact pressure. A pair of vacuum heads sucks any tire dust “KLAG” away from the brush and into a large Arrestall vacuum system. When the road surface stops, the roller brush is retracted away from the surface to prevent brush damage.

A daily control tire will be run to assure friction and sensor stability using SPC monitoring protocols.

An electric linear actuator adjusts the roller brush tension against the road wheel friction surface.

A variable frequency drive coordinates the brush surface speed with the road wheel.


Multiple vacuum hoses suction the rubber dust from the roller brush drive assembly. A small air cylinder underneath, retracts the assembly when the vacuum is turned off.