Renault have declared they will consider all options including appealing their disqualification from the Japanese Grand Prix.
Further evidence was submitted via email by both teams before the FIA concluded on Tuesday that that the system on the Renault made use of a grey area in F1's technical regulations, but still fell foul of Article 27.1 of the Sporting Regulations that requires the driver to drive his auto alone and unaided.
It was alleged that Renault were using a "pre-set, automated brake bias system", although the FIA found that the system was not tuned to a determined distance and was therefore not against technical regulations.
The FIA concluded that the system, therefore "does not breach" the technical regulations.
A statement from Renault on Thursday said: "We regret the stewards" decision and, in particular, the severity of the sanction applied.
The team said the penalty was "not proportionate to any benefit the drivers derived".
Renault do not agree with the verdict but will not take the matter any further, stating they did not wish to engage further in "sterile debate".
After further submissions from both Racing Point and Renault, the FIA Technical Department carried out an analysis of Renault's software and data and held a further hearing via teleconference on Wednesday.
The team also felt Renault had breached Articles 11.1.3, 11.1.4 and 8.6.3 of the technical regulations that outlaw powered devices that alter brake balance, or any system not controlled by the driver.
Renault said they believed their disqualification from the race result was "inconsistent with previous sanctions for similar breaches".
The period of time Renault has to appeal the stewards' decision is longer than normal due to the timezone difference between Europe and Mexico City, where this weekend's Mexican Grand Prix will take place.
"Formula One will always be an arena for the relentless search for the slightest possible opportunities for competitive advantage", the French team's statement continued. "It is what we have always done and will continue to do, albeit with stronger internal processes before innovative solutions are brought on track".
Despite the claim that the system could be seen via the on-board camera footage that shows the brake balance on the cars changing without any driver input, Renault refutes the allegation.