[Mrstaxxx]

quick question can a air mass flow sensor can cause your to downshift while breaking?

 

[turbogiotto]

On a YF sonata there's a MAP sensor not MAF . Work with air pressure in the intake.

 

[Mrstaxxx]

thanks

 

[mahout]

quick question can a air mass flow sensor can cause your to downshift while breaking?

More than likely you are experiencing downshift when the engine rpm drops below minimum gear/speed range, probably about 1200 rpm. Theres no expectation the engine will go into 'idle' so engine downshifts as the speed drops to keep enginre running. If it didn't the engine would stall and really complicate braking.