I have hyundai equus 2014 v8 suddenly while I'm driving the rpm start playing then the car started not shifting the gear probably then I lost the brake while I'm pressing the brake it comes full down without resistance shows auto hold on and traction on, then the car became normal but without brake now no resistance at all in the brake, the brake oil fluid is okay. Can u please help me.solve this issue
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Those cars are complex and it sounds like you may be having an electrical problem affecting the computer-controlled transmission. (Either that or the transmission is failing. You did not mention mileage. Has the transmission been properly serviced over the years?) Basics would be checking electrical connections and perform a diagnostic scan.
The brake problem is likely an internal leak in the master cylinder or ABS controller, or possibly a brake hose "ballooning" under pressure.
Most likely you are going to need a good mechanic with professional-grade tools to diagnose these problems as those cars are not very DIY-friendly.
You can find a repair manual for that car at the link below:
https://lemon-manuals.la/Hyundai/2014/