Ultimately it should not make any difference whether you are braking on a road or on a Mot roller , The pressure in the brake system is created by how hard you stand on the pedal ! The only difference is when you normally brake you do it in a more gentle controlled way to reduce speed rather than progressively braking harder to create a force on a roller similar to doing an emergency stop .Standing hard on the pedal will and induce greater pressures thus increasing chances of brake pipe failure
If one pipe has failed I would checking the other brake pipes
It is a good practice when you service your vehicle to actually press your brake pedal and keep weight on it to see if you actually have any pedal creep
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