On the road they can only test deceleration, not brake balance. If it's out a lot tester would feel a car pulling to one side but that could also be down to suspension issues not just brake balance.
Ideally you would have 4 wheel brake tester like the 4 wheel dyno but that would also increase MOT test time strapping car down and increased costs. I am not even sure if anybody makes 4 wheel brake testers.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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