Modern roller brake testers rotate the wheels on each axle in reverse directions, so each wheel is tested in the forward direction, but when they're doing the other side you should be able to see the non-tested side going backwards 
It means the axle isn't being wound up and nothing is being transmitted down the propshaft
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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