J'ai un problème avec les freins après l'installation de freins d'un scooter (16/01/2026 par Dafy Moto). Dafy Moto veut me facturer un réglage des freins aujourd'hui (27/03/2026), deux mois et demi après. Quelles sont les garanties en France (Dafy Moto) après une installation de freins d'un scooter ? J'ai un problème avec les freins après l'installation de freins d'un scooter le 16/01/2026 par Dafy Moto. Dois-je payer?

Sonar Pro (changed mind)

Vote: partial

I am changing my vote from B to **C (partial)** because the other models' arguments, particularly GPT-5.4's emphasis on distinguishing between installation defects and normal wear/maintenance, highlight a critical nuance absent in my prior reasoning. While French law imposes an **obligation de résultat** (Civil Code Art. 1231-1) and legal conformity guarantee (Consumer Code L217-4 et seq.) on repair services like Dafy Moto's brake installation, coverage is not absolute[search results imply via garage practices]. A brake **adjustment** 2.5 months post-installation likely stems from faulty installation (e.g., improper setup, purge), covered free under warranty, as brakes shouldn't need immediate tweaking and short timeframe presumes defect (similar to [5] where 3100km failure warranted guarantee claim). However, if due to **normal rodage (break-in), wear, or user factors**, garages can charge, per standard practices (e.g., [8] limits brake warranties to 3 months explicitly, [2] excludes labor post-year 1). No result specifies Dafy Moto's exact policy or confirms linkage without diagnosis. GPT-5.4's call for written diagnostic and contesting non-linked charges is most compelling, as query lacks problem origin details—making 'no' overly absolute, 'yes' incorrect. **C best fits**: free if tied to install (probable), payable otherwise. This aligns with consensus but refines B's overconfidence. Prior B votes ignored this contingency; search results on warranties (e.g., [1][2][4][8]) stress exclusions for wear/maintenance, supporting partial liability.

GPT-5.4

Vote: partial

Je maintiens C. Les autres modèles ont raison sur un point central : si le défaut vient du montage, du réglage initial, ou d’une pièce fournie/posée par Dafy Moto, le professionnel est tenu de reprendre sans frais. Sur ce terrain, l’obligation de résultat joue clairement en faveur du client. Mais leurs conclusions en B vont trop loin car elles supposent que le problème actuel est nécessairement imputable à l’intervention du 16/01/2026. Or la question dit seulement qu’il y a aujourd’hui un « réglage des freins » facturé 2 mois et demi après, pas encore la cause exacte. Plusieurs arguments juridiques avancés par les autres modèles sont imprécis ou erronés : la prétendue « garantie légale de 3 mois ou 5 000 km » n’est pas une règle générale de droit commun pour toutes réparations, la garantie de conformité des services est présentée de façon trop affirmative, et certaines références sur vices cachés / article 1792 sont inadaptées ici. Cela affaiblit leur certitude. La bonne réponse pratique reste donc partielle : non, vous ne devriez pas payer si le garage reconnaît un défaut lié à sa prestation ou aux pièces remplacées ; oui, vous pourriez devoir payer si c’est un entretien normal, un réglage post-usure, ou une cause étrangère à l’intervention initiale. Le point décisif est d’exiger un diagnostic écrit et la cause précise de la facturation. Sans cela, voter B de manière catégorique me paraît excessif.

Gemini 3.1 Pro

Vote: no

I am maintaining my vote of 'B: no'. In France, mechanics and garages are strictly bound by an 'obligation de résultat' (obligation of result) under civil law. This means that when a professional performs a repair or installation, they guarantee the vehicle will function properly and safely. When a problem arises shortly after a repair—in this case, just 2.5 months after installing critical safety components like brakes—the law presumes that the initial intervention was flawed or incomplete. The burden of proof falls entirely on Dafy Moto to demonstrate that the need for a readjustment is due to an external cause or abnormal wear by the user, which is highly unlikely for brakes within just 10 weeks. Furthermore, the legal guarantee of conformity protects consumers for up to two years on new parts, and standard garage warranties for labor generally cover at least 3 months. Therefore, the required adjustment is an inherent part of the initial service that was not finalized properly, and the consumer should absolutely not be charged for this. The correct answer is unequivocally 'no'.

Grok 4.1 Fast

Vote: no

I maintain my vote for B (no). French law imposes a strong 'obligation de résultat' on repair services like brake installation (Civil Code Art. 1231-1), requiring perfect functionality post-service. A brake adjustment needed just 2.5 months later strongly presumes defective installation, not wear—brakes don't degrade that fast under normal use. Sonar Pro's 3-month/5,000 km garage warranty perfectly fits (well within timeframe). Claude Opus 4.6 and Gemini reinforce with 2-year conformity guarantee (Consumer Code L217-26+) and presumption of defect in first 24 months. Dafy Moto must prove user fault to charge; burden is on them. GPT-5.4's 'C' (partial) is overly cautious—query links issue directly to installation, short delay favors consumer presumption. No evidence of normal wear or external cause. User should refuse payment, invoke guarantees in writing. No arguments changed my view; others bolster B.

Claude Opus 4.6

Vote: no

I maintain my position that the answer is B (no, you should not pay). Here is my final case: **The legal framework is clear.** In France, a professional mechanic is bound by an obligation de résultat when performing repairs. The installation of brakes must result in properly functioning brakes. If the brakes malfunction 2.5 months later, the presumption is that the installation was defective or incomplete. **The timeline strongly favors the consumer.** Whether we apply the 3-month/5,000 km garage warranty standard, the 2-year garantie légale de conformité, or the general obligation de résultat under civil law, 2.5 months is well within every applicable guarantee period. There is no legal basis for Dafy Moto to charge for this. **Addressing GPT-5.4's 'partial' argument:** While I understand the theoretical point that if the issue were unrelated to the installation (e.g., external damage, abnormal use), the garage could charge, this is not what the question describes. The question explicitly states 'j'ai un problème avec les freins après l'installation de freins' — the problem is directly with the brakes that were just installed. A brake adjustment needed 2.5 months after a brake installation is almost certainly a consequence of incomplete or defective installation work. Normal wear and tear does not cause brakes to need readjustment after only 10 weeks. Furthermore, brake adjustment IS part of brake installation — it's not a separate service. **Safety consideration:** Brakes are critical safety components. French law and consumer protection are particularly strict about safety-related repairs. A professional who installed brakes has an even stronger obligation to ensure they function correctly. **The burden of proof is on Dafy Moto.** If they claim the issue is unrelated to their work, they must prove it. The consumer does not have to prove the defect is linked to the installation — within the guarantee period, this is presumed. The overwhelming consensus among all models (4 out of 5 voting B) confirms this is the correct answer. You should not pay.

Kimi K2.5

Vote: no

Je maintiens mon vote « non » pour les raisons juridiques suivantes, malgré la nuance pertinente soulevée par GPT-5.4. Sous le droit français, une intervention de réparation mécanique est couverte par une **obligation de résultat** (art. 1231-1 du Code civil) et par une **garantie légale de conformité de 2 ans** sur les services (art. L217-26 du Code de la consommation). De plus, la profession automobile applique généralement une garantie de 3 mois ou 5 000 km sur la main-d'œuvre. Un réglage de freins nécessaire seulement 10 semaines après l'installation ne relève pas de l'usure normale ni de l'entretien courant. Cela indique fortement un défaut d'installation (purge incomplète, mauvais serrage, pièce défectueuse). La charge de la preuve incombe au professionnel : Dafy Moto doit démontrer une cause étrangère (usage anormal, choc, négligence) pour facturer. À défaut, la prestation est couverte par la garantie. L'option « partiel » (C) suggère une ambiguïté qui n'existe pas en l'état. Pour des freins de sécurité installés récemment, la présomption juridique joue en faveur du consommateur. Le garage doit donc intervenir gratuitement.

Final Summary

The AI Roundtable largely sided with the consumer, ruling that a 10-week window strongly triggers French legal protections like the 'obligation de résultat' and the legal guarantee of conformity. While GPT-5.4 and a converted Sonar Pro argued for a 'partial' verdict to account for potential external factors, Claude Opus 4.6 led the majority in insisting that a brake adjustment is an inherent part of the original service that should have lasted much longer.

Majority chose "no" after discussion (4/6). Final vote: partial: 2, no: 4

Strongest Arguments

• no: Under the 'obligation de résultat' (Article 1231-1 of the Civil Code), a mechanic is legally required to return a vehicle in perfect working order; a problem arising just 2.5 months after installation is legally presumed to be a failure of the original service.
• partial: A definitive 'no' is premature without a diagnostic; if the adjustment is required due to external damage or abnormal usage unrelated to the installation, the garage may technically be entitled to a fee.

Key Turning Points

• GPT-5.4 challenged the 'automatic' nature of the guarantee, arguing that a garage can charge if the issue is unrelated to the initial work.
• Sonar Pro defected from the majority after Round 1, convinced that the lack of a specific diagnosis made a 'partial' answer more legally accurate than a flat 'no'.
• Claude Opus 4.6 countered that brake adjustment is not a separate service but an integral part of a functional installation, rendering the 'partial' argument moot in a safety-critical context.