It's a solid bet that mistakes were made but I'm not sure how one would know that they have not been properly considered. Seems an ordinary tragedy, no? Inexperienced cyclist down a 25% grade at 40mph probably didn't use the front brake. Using the rear brake alone would have a much diminished effect on such an incline, thus the rider's perception of "my brakes have gone." It does not seem likely that two independent brake systems would fail simultaneously at exactly the worst time, and the forensic evidence does not support a brake failure.

Excerpt:
" . . . had owned the Genesis Equilibrium bike for eight months and had only been out on it a few times. . . had only ridden her new touring bike a couple of times . . . "

"After getting lost, their 25 mile ride turned into almost a 40 mile trip which took them down the notorious Winnats Pass . . . "

'Detective Constable Andrew Prince of Derbyshire Police's collision investigation unit, concluded there were "no significant issues" with the brakes but said the rear tyre was "significantly under-inflated." . . . And he suggested that her inexperience of road cycling, fatigue, and an under-inflated rear tyre may have all played a part in the tragedy.'

"Trevor Jones, a vehicle examiner with the force, said he could find no major faults with the brakes although he could not test them fully because of the damage the bike sustained."

"But Mr Nieto said that the evidence heard at the inquest showed no serious fault with the brakes on August's bike."