The chassis of the roller unit is hot-dip galvanised. The brake tester is available with gritted, splatter welded or ripped rollers, all of which give a friction co-efficiency comparable to a road surface.
The brake force is measured with a strain gauge transducer.
The roller unit is fitted with sensors detecting the presence of a wheel set on the rollers.
This system ensures that the rollers do not start accidentally.
A speed sensor measures the roller speed to ensure that the percentage of slippage is correct. The point of wheel lock can be set at 4 different settings.
The gearbox is a worm gear, which holds the rollers from turning too easily and thus makes it easier to drive the drive wheels out of the rollers.
