The DAF 55 and earlier were the ones not to put on a brake tester as there was no differential in effect .
The 66 and 300 were ok , BUT the rollers would have to turn over both transmission units and the inertia of this would cause a few jerks as they came up to speed for those not expecting it , always chock the front wheels Probably best to use the Tapley decelleration meter for the MOT Brake test though.
Still want the GLT Ian?
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 My comments are only based on my opinions and vast experience .
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