<p>Hybrid ceramic ball bearings, characterized by lightweight architecture and extended service life, find extensive application in high-end domains. Nevertheless, they exhibit susceptibility to thermal fatigue under the extreme operating conditions of aero-engines, which induces catastrophic failures and deteriorates operational reliability. This study presents a new five-degree-of-freedom dynamic model for hybrid ceramic ball bearings featuring compounded local defects. The model incorporates isothermal elasto-hydrodynamic lubrication (EHL) to enhance the precision of defect simulation. our model offers a more comprehensive approach which integrates coupling excitations, time-varying displacements, detailed stiffness, lubricant film thickness, radial clearance, and sliding friction forces. The model is capable to successfully predict vibration amplitude responses under varying speeds and defect sizes. Interestingly, it reveals a 0.0002-s delay in peak vibration amplitude during defect-ball-defect (D-B-D) sequential contact and an 82% reduction in amplitude during simultaneous defect impact. A comparison of proposed model has been done with existing model proposed by researcher in the context. The proposed five-degree-of-freedom model demonstrates superior performance, show more accurately simulates the vibration response of hybrid ceramic ball bearings under real operating conditions, providing valuable insights for early fault detection and diagnosis in complex dynamic environments.</p>