Aircraft Flight Operation Regulations Article 290-2

As of 4 November 2020, the pilot-in-command (PIC) shall report the runway braking action special air-report (AIREP) to local air traffic control unit when the runway braking action encountered is not as good as reported.
中文原文 航空器飛航作業管理規則第290-2條
中華民國一百十年十一月四日以後,機長發現跑道煞車減速效果未如所獲通報時,應立即向當地飛航管制機構報告。

English translation for reference only; the Chinese text prevails. Not legal advice.