I've never really given this any thought before. In my 15+ years of owning AWD 8s, all my MOTs have been done on a standard 2WD brake tester. Never had any issues as a result.
Also, if all the wheels are free turn (such as when the car is on a lift), I understand why turning the wheels by hand will result in wheels turning in opposite directions, due the way diffs work. However, I don't understand why it would be
necessary to have them turning in opposite directions on a brake tester. After all, they turn the same way on the road.
Quote:
Originally Posted by Adrian E
If garages don’t have the appropriate mode they should use a Tapley meter on the road, as mentioned earlier
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But that would surely only test the braking efficiency as a whole, not the individual braking efficiency at each wheel? In my experience, conventional brake testers often highlight potentially dangerous issues with a single caliper.
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Mark
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2002 FE S8 Ebony Black Pearl
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Cars Owned:
The Tesla Era: 2020 Model S Performance Ludicrous+ (present)
(Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability)
The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present)
The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo
The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust